Lessons From the Sea Page Grade 5 Unit 4
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- Plate Boundary
- Answers for Student Reading: Convergent and Divergent Boundaries Student reading part is in
- Discussion Question
| earthquake? If you have, you know that solid Earth can sometimes feel as unstable as a rowboat in a stormy sea. This is because it’s not all that solid. As a matter of fact, most of the Earth is made of thick, extremely hot gooey rock called magma. The upper part of this magma nearest the Earth’s surface is actually liquid, covered by a thin layer of cooled crust, kind of like the skin that forms on top of a cup of hot cocoa as it cools.
Deeper in the Earth, the magma gets even hotter, but it is no longer so liquid. As a matter of fact, at the very center of the Earth, the temperature is as hot as the surface of the sun, yet Earth’s core is solid because of the tremendous weight of rock pushing down on it from all directions. This weight is what we call pressure. Earth’s crust, which scientists call the lithosphere, is not whole, but cracked in many places, and these separate pieces are Earth’s tectonic plates. They are constantly moving, some going slowly toward each other, some slowly away from each other, and others trying to squeeze by, like people in a crowded elevator. Scientists are still studying what causes tectonic plates to move, but they believe it is from currents deep in the Earth’s asthenosphere, which rise up from the center like bubbles in hot soup. Lesson 1 Modeling Activity: The Earth M  aterials for Partners
Half a large orange, half a small lime, one maraschino cherry Six strips of index card, half an inch wide and two inches long. Scotch tape Six toothpicks One spoon One black fine point sharpie pen Work with a partner. The teacher will cut the fruit and provide all the materials you need for this activity. Label the index cards as follows: 1. Plate boundary 2. Hot spot 3. Crust 10–30 km thick, -60ºC – +60ºC. 4. Mantle 2,900 km, 500ºC – 2000ºC. 5. Outer Core 2,250 km thick, 2000ºC – 4000ºC. 6. Inner Core 1,200 km thick, 4,000ºC – 5,000ºC. Tape the index cards on the flat end of each toothpick to make a label. Draw a line with the sharpie pen on the outside of the orange peel from top to bottom. Stick the toothpick labeled Plate Boundary into this crack. Poke a hole through the orange peel crust with the toothpick labeled Hot Spot. Squeeze out a little juice (magma) from the hole, then leave the toothpick in. Scoop out the center of the half orange large enough to fit the half lime, and put the lime in the hole. Scoop out the center of the lime large enough to fit the maraschino cherry, and put the cherry in the hole. Name each part by sticking the toothpick label into the appropriate section: Orange skin = Crust; orange fruit = Mantle; lime = Outer Core; cherry = Inner Core. Have your teacher check your model. L  esson 1
Answers for Student Reading: Convergent and Divergent Boundaries Student reading part is in Comic San fonts. Discussion questions are in regular print and the suggested answers are in italics. Where two plates meet and come together, that is called a convergent boundary. Convergent boundaries are like a slow-motion train wreck, a head-on collision between the two biggest monster trucks imaginable. Trillions of tons of rock from one plate are smashing into trillions of tons of rock from another, and neither one is giving an inch, neither stopping nor slowing down. Discussion Question: With forces far greater than two giant mountains smashing into each other, what kinds of effects do you think they cause? Earthquakes, volcanoes. Volcanoes are created by this collision of plates, island arcs are formed too, as well as all the world’s mountain ranges! How do you think this happens? When the two giant masses of rock come together, they have to go somewhere, right? Usually the heavier rock, which is the lithosphere from the ocean bottom, grinds its way under the lighter rock of the continental crust. Directory: pub -> MSC pub -> The german unification, 1815-1870 pub -> Baltic Olympiads in Informatics: Challenges for Training Together pub -> Preparation of Papers for ieee transactions on medical imaging pub -> Forthcoming meetings and conferences pub -> Asilomar Conference on Circuits, Systems & Computers, Pacific Grove, ca, November 1978, pp. 55 58 pub -> Forthcoming meetings and conferences pub -> Harmonised compatibility and sharing conditions for video pmse in the 7 9 ghz frequency band, taking into account radar use MSC -> Mscr cover Page Unit Checklist Done? MSC -> Mscr cover Page Unit Checklist – G3U6 Done? Download 5.39 Mb. Share with your friends:
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