Physics Of Earthquakes And Its Effects - 1597 Words

Physics of Earthquakes Introduction A failure in the interior of the Earth’s crust is the cause of most earthquakes. Once the stress inside the crust grows beyond the strength for that location of the crust, a failure occurs within the crust and seismic waves, which we know as earthquakes, are radiated outward. It was once thought that this description of seismic activity was the cause for all earthquakes, but now seismologists know the way earthquakes form and start is a very diverse process. Most earthquakes are classified in the category of being brittle failures, which generate strong seismic waves; some earthquakes involve slow slip motion. There is also evidence to suggest that some earthquakes are more of a thermal process due to large amounts of heat generation, rather than large seismic activity. (Scholz 2002) Also, some earthquakes are not the result of faulting however, but caused by large landslides. In the early days of seismology, these differences were noticed qualitatively but the technology avai lable during that time made it hard to accurately tell the difference. Before an earthquake takes place, there is a large buildup of potential energy. The energies involved in earthquakes can be described by the elastic strain energy W, plus the radiated energy Er, the energy mechanically dissipated during an earthquake, Eg and the thermal energy due to heat dissipation, Eh. Since this equation is a description of potential energies, the actual event of anShow MoreRelatedA Report On Marine Geophysicists1081 Words   |  5 Pagesdanger. After 2004, a 9.1 earthquake induced the Indian Tsunami that killed more than 250,000 people and left a million others affected in one day, people started to observe the amount of destruction caused by tsunamis (Helal Mehanna, 2008, p.787). The disaster was of such a magnitude that now has educated most people about the subject. The idea of it being a usual wave began to seem unlikely. Tsunamis are provoked by different phenomena than ordinary waves ; mainly by earthquakes, abrupt discharges ofRead MoreFracking, An Energy Extraction Process1534 Words   |  7 PagesINTRODUCTION Hydraulic fracturing, commonly known as fracking, is an energy extraction process that has recently been consumed in a lot of controversy regarding the possible side effects that it could be having on the environment. Specifically, fracking is a method used to extract and release natural gas and petroleum from under deep layers of hard rock called shale rock located thousands of feet under the Earth’s surface. This process has been around since the 1940’s and involves the injection ofRead MoreInformative Speech On Haarp1193 Words   |  5 Pagesshut down due insufficient funds. c. In August 2015, University of Alaska Fairbanks was given control of the facility and the equipment. B. What is it? 1. HAARP is a 290 million dollar military funded project that is used to study the effect and responses of the ionosphere by shooting it with very low frequency radio waves which could be used for long distance communications. a. HAARP consists of 180 silver poles that stick out of the ground and are spaced evenlyRead MoreScience And Technology : Science862 Words   |  4 Pagesdevice that is used to measure earthquakes. This is technology and science depending on each other because the device is technology and it is being used to help science. This science is learning about the earth’s structure and activity. From this device, scientists can measure how strong the earth’s magnitude was. According to earthquakecountry.org, â€Å"By knowing how fast seismic waves travel through the earth, seismologists can calculate the time when the earthquake occurred and its location by comparingRead MoreEssay on Astrology and Its Role in Our World3364 Words   |  14 Pagessuccess. Some won’t even think about planting crops without this information. This is a form of astrology, although many people do not realize it. A popular form of astrology is the Physic Friends Network. This is a 900 number you can call in to see what your sign is and how this affects you. The astrologers on the Physic Friends Network always seem to know what has happened in the past and what will occur in the future. Everyone who says they are astrologers obviously are not and it’s up to us to useRead MoreIs Nuclear Power Worth the Risk? Essay1099 Words   |  5 Pagesamount of energy, it is powerful and efficient. No air pollution Unlike fossil fuels, nuclear energy has the lowest impact on the environment since it does not release any gases like carbon dioxide, methane which are largely responsible for greenhouse effect. Therefore, nuclear is treated as a clean source of energy supply. Lower operating costs The cost of uranium is quite low. 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Nonetheless, many people focus on wars negative consequences, while positive effects are downplayed. War is a necessary evil in the sense that it stabilizes population, encourages technological advances, and has a very high economic value. Without war, the overpopulation of the human race is inevitable. It is this reason that war is a useful tool by not only Mother Nature, but alsoRead MoreProject Star Wars And Project A 119944 Words   |  4 PagesS. dropped an atomic bomb over Hiroshima, Japan, and three days later another bomb over Nagasaki, Japan. An estimated 140,000 peopled died in the first blast, and 80,000 in the second, with untold numbers later dying of cancer and other radiation effects. (It should be noted that these cities are once again inhabited, though the location of the nuclear reactor meltdown in Chernobyl, Russia is not. 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Top Tips for Observing Mitosis Lab

We have all seen illustrations in textbooks of how mitosis works. While these types of diagrams are definitely beneficial for visualizing and understanding the stages of mitosis in eukaryotes and connecting them all together to describe the process of mitosis, it is still a good idea to show students how the stages actually look under a microscope in an actively dividing group of cells. Necessary Equipment for This Lab In this lab, there are some necessary equipment and supplies that would need to be purchased that go beyond what would be found in all classrooms or homes. However, most science classrooms should already have some of the necessary components of this lab and it is worth the time and investment to secure the others for this lab, as they can be used for other things beyond this lab. Onion (or Allum) root tip mitosis slides are fairly inexpensive and easily ordered from various scientific supplies companies. They can also be prepared by the teacher or students on blank slides with coverslips. However, the staining process for homemade slides are not as clean and exact as those that are ordered from a professional scientific supply company, so the visual may be somewhat lost. Microscope Tips Microscopes used in this lab do not have to be expensive or high powered. Any light microscope that can magnify at least 40x is sufficient and can be used to complete this lab. It is recommended that students are familiar with microscopes and how to use them correctly before beginning this experiment, as well as the stages of mitosis and what happens in them. This lab can also be completed in pairs or as individuals as the amount of equipment and skill level of the class allows. Alternatively, photos of onion root tip mitosis can be found and either printed onto paper or put into a slideshow presentation in which the students can do the procedure without the need for microscopes or the actual slides. However, learning to use a microscope properly is an important skill for science students to have. Background and Purpose Mitosis is constantly happening the meristems (or growth regions) of roots in plants. Mitosis occurs in four phases: prophase, metaphase, anaphase, and telophase. In this lab, you will determine the relative length of time each phase of mitosis takes in the meristem of an onion root tip on a prepared slide. This will be determined by observing the onion root tip under the microscope and counting the number of cells in each phase. You will then use mathematical equations to figure out time spent in each phase for any given cell in an onion root tip meristem. Materials Light microscope Prepared Onion Root Tip Mitosis Slide Paper Writing utensil Calculator Procedure 1.  Create a data table with the following headings across the top: Number of Cells, Percentage of all Cells, Time (min.); and the stages of mitosis down the side: Prophase, Metaphase, Anaphase, Telophase. 2.  Carefully put the slide on the microscope and focus it under low power (40x is preferred). 3.  Choose a section of the slide where you can clearly see 50-100 cells in the different stages of mitosis (each â€Å"box† you see is a different cell and the darker stained objects are chromosomes). 4.  For each cell in your sample field of view, determine whether it is in prophase, metaphase, anaphase, or telophase based on the appearance of the chromosomes and what they should be doing in that phase. 5.  Make a tally mark under the â€Å"Number of Cells† column for the correct stage of mitosis in your data table as you count your cells. 6.  Once you have finished counting and classifying all of the cells in your field of view (at least 50), calculate your numbers for â€Å"Percentage of All Cells† column by taking your counted number (from Number of Cells column) divided by the total number of cells you counted. Do this for all stages of mitosis. (Note: you will need to take your decimal you get from this calculation times 100 to make it into a percentage) 7.  Mitosis in an onion cell takes approximately 80 minutes. Use the following equation to calculate data for your â€Å"Time (min.)† column of your data table for each stage of mitosis:  (Percentage/100) x 80 8.  Clean up your lab materials as directed by your teacher and answer the analysis questions. Analysis Questions 1.  Describe how you determined which phase each cell was in. 2.  In which phase of mitosis was the number of cells the greatest? 3.  In which phase of mitosis was the number of cells the fewest? 4.  According to your data table, which phase takes the least amount of time? Why do you think that is the case? 5.  According to your data table, which phase of mitosis lasts the longest? Give reasons as to why this is true. 6.  If you were to give your slide to another lab group to have them repeat your experiment, would you end up with the same cell counts? Why or why not? 7.  What could you do to tweak this experiment in order to get more accurate data? Expansion Activities Have the class compile all of their counts into a class data set and recalculate the times. Lead a class discussion on the accuracy of data and why it is important to use large amounts of data when calculating in science experiments.

Deception Point Page 111 Free Essays

Rachel blushed, her skin tingling. â€Å"Thanks.† The agent led Rachel down the impeccably appointed hallway to a plain-looking doorway nearby. We will write a custom essay sample on Deception Point Page 111 or any similar topic only for you Order Now â€Å"The Lincoln Bedroom,† the agent said. â€Å"And as I am always supposed to say outside this door, ‘Sleep well, and beware of ghosts.'† Rachel nodded. The legends of ghosts in the Lincoln Bedroom were as old as the White House itself. It was said that Winston Churchill had seen Lincoln’s ghost here, as had countless others, including Eleanor Roosevelt, Amy Carter, actor Richard Dreyfuss, and decades of maids and butlers. President Reagan’s dog was said to bark outside this door for hours at a time. The thoughts of historical spirits suddenly made Rachel realize what a sacred place this room was. She felt suddenly embarrassed, standing there in her long football jersey, bare-legged, like some college coed sneaking into a boy’s room. â€Å"Is this kosher?† she whispered to the agent. â€Å"I mean this is the Lincoln Bedroom.† The agent winked. â€Å"Our policy on this floor is ‘Don’t ask, don’t tell.'† Rachel smiled. â€Å"Thanks.† She reached for the door-knob, already feeling the anticipation of what lay beyond. â€Å"Rachel!† The nasal voice carried down the hallway like a buzz saw. Rachel and the agent turned. Corky Marlinson was hobbling toward them on crutches, his leg now professionally bandaged. â€Å"I couldn’t sleep either!† Rachel slumped, sensing her romantic tryst about to disintegrate. Corky’s eyes inspected the cute Secret Service agent. He flashed her a broad smile. â€Å"I love women in uniform.† The agent pulled aside her blazer to reveal a lethal-looking sidearm. Corky backed off. â€Å"Point taken.† He turned to Rachel. â€Å"Is Mike awake, too? You going in?† Corky looked eager to join the party. Rachel groaned. â€Å"Actually, Corky†¦ â€Å" â€Å"Dr. Marlinson,† the Secret Service agent intervened, pulling a note from her blazer. â€Å"According to this note, which was given to me by Mr. Tolland, I have explicit orders to escort you down to the kitchen, have our chef make you anything you want, and ask you to explain to me in vivid detail how you saved yourself from certain death by†¦ † the agent hesitated, grimacing as she read the note again. â€Å"†¦ by urinating on yourself?† Apparently, the agent had said the magic words. Corky dropped his crutches on the spot and put an arm around the woman’s shoulders for support, and said, â€Å"To the kitchen, love!† As the indisposed agent helped Corky hobble off down the hall, Rachel had no doubt Corky Marlinson was in heaven. â€Å"The urine is the key,† she heard him saying, â€Å"because those damned telencephalon olfactory lobes can smell everything!† The Lincoln Bedroom was dark when Rachel entered. She was surprised to see the bed empty and untouched. Michael Tolland was nowhere to be seen. An antique oil lamp burned near the bed, and in the soft radiance, she could barely make out the Brussels carpet†¦ the famous carved rosewood bed†¦ the portrait of Lincoln’s wife, Mary Todd†¦ even the desk where Lincoln signed the Emancipation Proclamation. As Rachel closed the door behind her, she felt a clammy draft on her bare legs. Where is he? Across the room, a window was open, the white organza curtains billowing. She walked over to close the window, and an eerie whisper murmured from the closet. â€Å"Maaaarrrrrrrry†¦ â€Å" Rachel wheeled. â€Å"Maaaaaarrrrrrrry?† the voice whispered again. â€Å"Is that you?†¦ Mary Todd Liiiiiincoln?† Rachel quickly closed the window and turned back toward the closet. Her heart was racing, although she knew it was foolish. â€Å"Mike, I know that’s you.† â€Å"Noooooo†¦ † the voice continued. â€Å"I am not Mike†¦ I am†¦ Aaaaabe.† Rachel put her hands on her hips. â€Å"Oh, really? Honest Abe?† A muffled laugh. â€Å"Moderately honest Abe†¦ yes.† Rachel was laughing now too. â€Å"Be afraaaaaaid,† the voice from the closet moaned. â€Å"Be veeeeeery afraid.† â€Å"I’m not afraid.† â€Å"Please be afraid†¦ † the voice moaned. â€Å"In the human species, the emotions of fear and sexual arousal are closely linked.† Rachel burst out laughing. â€Å"Is this your idea of a turn-on?† â€Å"Forgiiiive me†¦ † the voice moaned. â€Å"It’s been yeeeeeeears since I’ve been with a woman.† â€Å"Evidently,† Rachel said, yanking the door open. Michael Tolland stood before her with his roguish, lopsided grin. He looked irresistible wearing a pair of navy blue satin pajamas. Rachel did a double take when she saw the presidential seal emblazoned on his chest. â€Å"Presidential pajamas?† He shrugged. â€Å"They were in the drawer.† â€Å"And all I had was this football jersey?† â€Å"You should have chosen the Lincoln Bedroom.† â€Å"You should have offered!† â€Å"I heard the mattress was bad. Antique horsehair.† Tolland winked, motioning to a gift-wrapped package on a marble-topped table. â€Å"This’ll make it up to you.† Rachel was touched. â€Å"For me?† â€Å"I had one of the presidential aides go out and find this for you. Just arrived. Don’t shake it.† She carefully opened the package, extracting the heavy contents. Inside was a large crystal bowl in which were swimming two ugly orange goldfish. Rachel stared in confused disappointment. â€Å"You’re joking, right?† â€Å"Helostoma temmincki,† Tolland said proudly. â€Å"You bought me fish?† â€Å"Rare Chinese kissing fish. Very romantic.† â€Å"Fish are not romantic, Mike.† â€Å"Tell that to these guys. They’ll kiss for hours.† â€Å"Is this supposed to be another turn-on?† â€Å"I’m rusty on the romance. Can you grade me on effort?† â€Å"For future reference, Mike, fish are definitely not a turn-on. Try flowers.† Tolland pulled a bouquet of white lilies from behind his back. â€Å"I tried for red roses,† he said, â€Å"but I almost got shot sneaking into the Rose Garden.† As Tolland pulled Rachel’s body against his and inhaled the soft fragrance of her hair, he felt years of quiet isolation dissolving inside him. He kissed her deeply, feeling her body rise against him. The white lilies fell to their feet, and barriers Tolland had never known he’d built were suddenly melting away. The ghosts are gone. He felt Rachel inching him toward the bed now, her whisper soft in his ear. â€Å"You don’t really think fish are romantic, do you?† â€Å"I do,† he said, kissing her again. â€Å"You should see the jellyfish mating ritual. Incredibly erotic.† Rachel maneuvered him onto his back on the horsehair mattress, easing her slender body down on top of his. â€Å"And seahorses†¦,† Tolland said, breathless as he savored her touch through the thin satin of his pajamas. â€Å"Seahorses perform†¦ an unbelievably sensual dance of love.† â€Å"Enough fish talk,† she whispered, unbuttoning his pajamas. â€Å"What can you tell me about the mating rituals of advanced primates?† Tolland sighed. â€Å"I’m afraid I don’t really do primates.† Rachel shed her football jersey. â€Å"Well, nature boy, I suggest you learn fast.† Epilogue The NASA transport jet banked high over the Atlantic. Onboard, Administrator Lawrence Ekstrom took a last look at the huge charred rock in the cargo hold. Back to the sea, he thought. Where they found you. On Ekstrom’s command, the pilot opened the cargo doors and released the rock. They watched as the mammoth stone plummeted downward behind the plane, arcing across the sunlit ocean sky and disappearing beneath the waves in a pillar of silver spray. How to cite Deception Point Page 111, Essay examples