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29 Cards in this Set
- Front
- Back
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What are tectonic plates?
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The earth's lithosphere is broken up into seval major plates (pieces).
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What is Pangaea?
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A supercontinent believed to have existed sometime in earth's past.
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Who is Alfred Wegener?
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German scientist who came up with idea of Pangea and continental drift.
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What is continental drift?
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Idea that earth's plates move around on the asthenosphere.
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What are evidences for continental drift?
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Puzzle pieces (continents)
Fossil Rocks match Glacier evidence |
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What is a plate boundary?
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Where 2 plates interact.
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What is a fault?
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A crack (major or minor) in earth's surface caused by geologic forces.
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What happens at plate boundaries?
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The earth's surface is reshaped.
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What is a convergent boudary?
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2 plates collide (come toether).
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What forms as a result of a convergent boudary (4 things)?
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Folded mountains, trench, volcanoes, earthquakes
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What is subduction?
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Oceanic plate (dense-heavy) sinks below a continental plate (less dense-heavy)
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What is a trench?
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Deep crevasse or valley formed from subduction (deepest part of ocean).
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What is a divergent boundary?
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Where 2 plates pull apart.
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What forms as a result of a divergent boundary?
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Mid ocean ridge (Mid Atlantic Ridge) volcano, or a rift valley (on land).
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What is a transform boundary?
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Where 2 plates grind (slide past) each other.
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What happens as a result of a transform boundary?
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Earthquakes!
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What is a hot spot?
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Super hot place in mantle. Causes magma to rise = volcanic island (Hawaii)
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What is an island arc?
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Islands formed by subduction.
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What is sea floor spreading?
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Concept that new crust is formed at mid-ocean ridges and recycled at trenches.
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What is the ring of fire?
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Beltlike region around Pacific having lots of earthquake and volcanic activity due to converging plates
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What exactly is plate tectonics?
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The science of explaining how continental drift works.
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What is believed to be the cause/force behind continental drift?
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Convection within the mantle.
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Describe convection.
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Rising hot fluids...like a lava lamp (less dense rises).
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Why are gases and liquids both considered fluids?
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They flow!
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What is plasticity?
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Describes mantle magma...semi liquid material.
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What is a destructive force?
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Tend to tear down landforms.
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Give 3 examples of destructive forces.
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Weathering, erosion (waves), subduction of oceanic plate
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What is a constructive force?
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Tends to build up landforms.
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Give 2 examples of constructive forces.
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Deposition of sediments, mountain building (folded and volcanic)
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