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7th Changing Earth

TermDefinition
superposition layers of rock are dated by oldest on bottom and youngest on top
plate tectonics theory that explains how the surface of the Earth changes
seafloor spreading New ocean floor is created at a mid–ocean ridge as two tectonic plates move away from one another; older crust near continent
divergent boundary The lithospheric plates are moving away from each other.
rift valley a lowland region that forms where Earth's tectonic plates move apart.
mid ocean ridges a long underwater mountain range formed when two tectonic plates move or pull apart from each other
convergent boundary A boundary where two pieces of the Earth’s crust are colliding.
subduction zone Occurs at convergent plate boundaries; the process where one plate slides under another.
ocean trench long, narrow depressions on the seafloor that form at the boundary of tectonic plates where one plate is pushed beneath another
transform boundary The boundary between two tectonic plates that are sliding past one another.
plate tectonics scientific theory that explains how major landforms are created as a result of Earth's plates moving
continental crust thick part of the Earth's crust that forms the large landmasses
fault A crack within the Earth’s rocky crust.
oceanic crust thin part of Earth’s crust found under the oceans
hot spot an area of the Earth's mantle from which hot plumes rise upward, forming volcanoes on the overlying crust
supervolcano arge volcano having the potential to produce an eruption with major effects on the global climate and ecosystem
Created by: NEISDSci
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