Warm Up – Page 78Warm Up – Page 78

Answer this on page 78 in your notebook:Mrs. Wilson, I still don’t get

_________________. Could you explain it again?

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P-Waves – move back and forth and through liquids and solids

S-Waves – move up and down and side to side and only through solids

By studying seismic waves, scientists realized the outer core is liquid

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Temperature, pressure, and density all increase

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Because of the intense pressure

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In the ocean – oceanic crust

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The lithosphere

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The asthenosphere

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Inner core – solid and outer core – liquid

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The movement of the liquid outer core

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Lower mantle

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All the continents were once part of a supercontinent. The continents separated and drifted to their present locations over time.

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He could not explain the mechanism that could move the continents

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Geologic – fit of South America and AfricaFossil – various fossils found in places

where the animals could not have traveled by water

Climate – tropical climate fossils found in cold areas; glacier deposits in Africa

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Mountains formed at oceanic-oceanic divergent plate boundaries

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As plates diverge, the sea floor spreads – or becomes larger; on the other side of the world, plates subduct so that the earth does not get larger

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Older rocks were farther from the ridge and younger rocks were near the ridge

The magnetic patterns in the rocks from the magnetic field reversals

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Deep ocean trenches are created at subduction zones as the older piece of plate once again becomes part of the mantle

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Oceanic crust – more dense – basaltContinental crust – less dense - granite

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The plate that is more dense will subduct under the less dense plate; trenches, volcanoes, and mountains can form

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Divergent – two plates move away from each other

Convergent – two plates move towards each other

Transform –two plates slip past each other

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Mountain ranges

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Deep ocean trenches and volcanic mountain ranges

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Deep Ocean Trenches, Volcanoes, and Island Arcs

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Rift valleys and volcanoes

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