NATS 102 ch 7

NATS 102 ch 7 - Chapter 7 Earth and the Terrestrial Worlds...

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Chapter 7 Earth and the Terrestrial Worlds
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Mercury craters smooth plains, cliffs
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Venus volcanoes few craters Radar view of a twin- peaked volcano
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Mars some craters volcanoes riverbeds?
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Moon craters smooth plains
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Earth volcanoes craters mountains riverbeds
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Why have the planets turned out so differently, when they formed at the same time from the same materials?
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Our Goals for Learning • Why is Earth geologically active? • What processes shape Earth’s surface? • How does Earth’s atmosphere affect the planet? 7.1 Earth as a Planet
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Why is Earth geologically active?
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Why is Earth geologically active? Short answer: the Earth is big enough to still have a hot interior. So what do we know about the interior of the Earth and why is it hot?
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Internal Structure, by density
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Internal structure, by rock strength The “lithosphere” is the cool rigid rock that forms a planet’s outer layer: the crust and some of the mantle. The lithosphere floats on the lower layers.
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The thickness of the lithosphere controls many geological processes
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Internal Structure of the Terrestrial Planets
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Sources of Internal Heat 1) Gravitational potential energy of accreting planetesimals 2) Differentiation 3) Radioactivity
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Why do water and oil separate? A. Water molecules repel oil molecules electrically. B. Water is denser than oil, so oil floats on water. C. Oil is more slippery than water, so it slides to the surface of the water. D. Oil molecules are bigger than the spaces between water molecules.
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Why do water and oil separate? A. Water molecules repel oil molecules electrically. A. Water is denser than oil, so oil floats on water. A. Oil is more slippery than water, so it slides to the surface of the water. B. Oil molecules are bigger than the spaces between water molecules.
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Differentiation Layers ordered by density Highest density on the bottom Gravity sorts materials by density. Differentiation converts gravitational potential energy to heat .
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What cools off faster? A. A grande-size cup of Starbucks coffee B. A teaspoon of capuccino in the same cup.
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What cools off faster? A. A grande-size cup of Starbucks coffee A. A teaspoon of capuccino in the same cup.
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What cools off faster? A. A big terrestrial planet. B. A tiny terrestrial planet.
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What cools off faster? A. A big terrestrial planet. A. A tiny terrestrial planet. Why?
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What happens to Silly Putty if you pull it VERY SLOWLY? A. It stretches. B. It breaks. C. Nothing.
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What happens to Silly Putty if you pull it SHARPLY? A. It stretches. A. It breaks. A. Nothing.
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Do rocks s-t-r-e-t-c-h? A. No - rock is rigid and cannot deform without breaking. B. Yes - but only if it is molten rock. C. Yes - rock under strain may slowly deform.
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A. No - rock is rigid and cannot deform
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NATS 102 ch 7 - Chapter 7 Earth and the Terrestrial Worlds...

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