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Plate Tectonics

TermDefinition
mid-ocean ridge mountain range underwater
sea floor spreading molten rocks flows up through earth's crust and hardens into solid strips of new rock
subduction sinking ocean floor
ocean trenches undersea valleys
divergent boundary 2 plates spreading apart forming rift valleys and mid-oceanic ridges
convergent boundary 2 plates moving toward each other either pushing up when meet to form mountain or slip over each other
transform boundary changes to the land above and the ocean floor
stress a force that acts on rock to change its shape or volume
tension pulls on earth's crust to make it thinner half between has the most tension
compression squeezes rock until it bends or breaks
shearing rock pushed in opposite directions results in a bend or break
fault break in the rock of the Earth's crust or mantle
scale folds that bend up become mountains or folds downward become valleys
earthquake formed from plate movement causing shaking and trembling
seismographs measure the the earth's surface waves let you know how bad an earthquake
magnitude single number to measure the size of an earthquake determines the damage it may cause
tsunami tremendous wave produced by an earthquake or landslide
volcano structure that forms in earth's crust made of magma and molten material at earth's surface
magma molten mixture of rock, gases and water in the volcano
lava out of the volcano on earth's surface
hot spot area where lava frequently erupts
extinct dead volcano
dormant sleeping volcano
active immediate threat can erupt at anytime
Created by: cimino
Popular Earth Science sets

 



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