Terms in this set (24)
The partially melted portion of the mantle below the lithosphere; tectonic plates move along this layer.
The rigid outermost layer of Earth that includes the uppermost mantle and crust.
The circulation of material caused by differences in temperature and density; responsible for moving Earth's plates.
The thin, dense portion of Earth's crust.
The thicker, less dense portion of Earth's crust.
He proposed the continental drift hypothesis.
The name given to a single large landmass that began to break apart approximately 200 million years ago.
The idea that the continents were once formed in a single landmass, broke up, and drifted to their current locations.
fossils, location of mountain ranges, and climate conditions
Evidence that supported Wegener's idea of continental drift.
The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge.
A volcanic-mountain range found in the middle of the oceans; it is the location of seafloor spreading.
A long, narrow deep crack in the ocean floor where old oceanic crust sinks and melts back into the mantle.
The process that occurs when a denser tectonic plate moves under another tectonic plate.
(1) Age of rock is older furthest away from the ridge. (2) Magnetic mirror image patterns on the ocean floor.
Evidence that supported the idea of seafloor spreading.
Theory of Plate Tectonics
The idea that the lithosphere is divided into tectonic plates that are moving across the asthenosphere.
The boundary between two tectonic plates that move away from each other; creating mid-ocean ridges and rift valleys.
The boundary between two tectonic plates that slide past each other; creating only earthquakes.
The boundary between two tectonic plates that are colliding and moving toward each other.
oceanic-oceanic convergent boundary
A type of convergent boundary where one oceanic plate subducts under the other; creating trenches and volcanic islands arcs.
oceanic-continental convergent boundary
A type of convergent boundary where the oceanic plate subducts under the continental plate; creating trenches and volcanoes.
continental-continental convergent boundary
A type of convergent boundary where one plate crashes into the other, buckling and thickening; creating mountain ranges.
Scientists could not determine how continents moved.
Why was Wegener's ideas about continental drift rejected?
earthquakes, volcanoes, and mountain formation
Events that occur at plate boundaries.
A place where two plates meet, causing dramatic changes in Earth's crust.
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