Astronomy Test 2 - AST 309 Don't forget everything you...

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AST 309 Don’t forget everything you learned in chapters 1-3. What are the three main layers of the interior of the Earth? How do they differ in composition? Where is the interior liquid and where is it solid? How do we know these facts about the Earth’s interior? The three main layers of the Earth are the crust, mantle and core . The crust is a very thin layer on top of the mantle that is less dense than the rest of the inner Earth and is made up of basalt and white granite, with feldspars and quartz. The mantle is the region of the Earth between the crust and the core and makes up most of earths bulk and is mostly made up of dense minerals called olivine and pyroxene. The core of the Earth is extremely dense and is made up of both solid and liquid parts. It is mostly made up of iron with a small solid middle. The interior of the Earth is liquid in the lower mantle and outer core, and solid in the crust, upper mantle, and inner core. We know this about Earth’s interior because of the way seismic waves travel through different materials and densities and their variations from an earthquake can tell us about what they have passed through. Describe continental drift. What causes it, what effects does it have on the surface of the Earth, and how do we know it is happening? Continental drift is the theory is that all of the continents are always slowly moving propelled by churning magma in the mantle. Over millions of years, the actual landmasses on the earth move to different locations and redraw the map of the earth. What is the ozone layer? Why is it useful? How have we affected it? Describe what determines the equilibrium temperature of a planet with no
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This note was uploaded on 04/06/2008 for the course AST 309 taught by Professor Johnlacy during the Spring '08 term at University of Texas at Austin.

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Astronomy Test 2 - AST 309 Don't forget everything you...

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