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19 Cards in this Set
- Front
- Back
Geologists
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scientists who study the forces that make and shape planet Earth
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The 3 main layers of earth's interior
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the crust, the mantle, and the core
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Crust
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outer skin, 5-40km thick, consists of basalt which is dense and granite which is less dense
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Mantle
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solid, lithosphere-top layer 100km thick, asthenospher-bottom layer 3,000km thick and soft
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Core
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liquid outer core, solid inner core
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radiation
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transfer of energy through empty space
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Conduction
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heat transfer by directy contact of particles of matter
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Convection
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heat transfer by movement of a heated fluid
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Alfred Wegner
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came up with theory of pangea (supercontinent) that began to break apart known as continental drift.
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Evidence for continental drift
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Landforms, fossils, climate
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discoverer of sea floor spreading
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harry hess
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Sea floor spreading
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molten material rises from the mantle and erupts and spreads out to form ridges
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Evidence for sea floor spreading
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molten material, magnetic stripes, and drilling sample
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Subduction
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process by which the ocean floor sinks beneath a deepocean trench and back into the mantle
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Plate techtonics
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states that pices of earth's lithosphere are in constant, slow motion, driven by convection currents in the mantle
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Plate Boundaries
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divergent, convergent, and transform
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Transform Boundaries
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place where two plates slip past each other, moving in opposite directions. earthquakes occur
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Divergent Boundaries
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place where two plates move apart, or diverge. creates rift valley
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Convergent Boundaries
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place where two plates come together, or converge. creating a collision.
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