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16 Cards in this Set
- Front
- Back
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How do geologist gather evidence about earths interior
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Using seismic waves
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What are the layers that make up the earth? Write a sentence about each one.
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Core-the core is very hot it is about as hot as the suns surface.
Mantle-the mantle is halfway to the core, it is 2,900 km deep. Crust-the crust is a solid rocky outer layer, including both the land surface and the ocean floor. |
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What happens in earth's interior to produce earth's magnetic field? Describe the layers of the interior where the magnetic field is produced.
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currents in the outer core create earth's magnetic field to cause the planet to act like a giant bar magnet.
currents in the liquid outer core force the solid inner core to spin at a slightly faster rate then the rest of the planet |
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What are 3 types of heat transfer?
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Radiation,Conduction,Convection
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Describe how convection currents form?
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durring convection heated particles of fluid began to flow transferring heat energy from one part of the fluid to another.
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In general, what happens to the density of a fluid when it becomes hotter?
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As the liquid at the bottom of the pot gets hot it expands and therefore becomes less dense.
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What happens to convection currents when a fluid reaches a constant temperature?
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convection will eventually stop when all the materials has reached the same temperature
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What was Wegener's theory of continental drift?
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that all the continents were one.Then they all broke up into their own continents.
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How did Wegener use evidence based on fossils to support his theory of continental drift?
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fossils have been found in places now separated by ocean. Reptile could not have swam great distances in salt water. therefore these reptiles lived on a single land mass that sense has been apart.
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What is the role of the mid-ocean ridge in sea-floor spreading?
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at the mid ocean ridge molten materials rises from the mantle and erupts. the molten materials then spread out pushing older rocks to both sides of the ridge this is sea floor spreading.
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What is the evidence of sea floor spreading?
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evidence from molten materiel,magnetic stripes, and drilling samples.
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Describe the processes of subduction at a deep ocean trench?
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the ocean floor sinks beneath the ocean floor and back into the mantle.
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What is the theory of plate tectonics?
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Geological theory that states that earths lithosphere are in constant slow motion driven by convection currents in the mantle.
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What are the deferent types of boundaries found along the edges of earth's plates?
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transform boundaries divergent boundaries and convergent boundaries.
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What major event in earth's history began about 225 MILLION years ago? EXPLAIN.
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Pangea began to break apart.
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Is maxmann925 really awesome true or false?
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TRUE YOU FOOL
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