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Plate tectonics Word Scramble

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Science Vocab 147928

500 Words

Question	Answer
divergent	boundary where 2 plates are moving away from each other; associated with mid-ocean ridges
convergent	boundary where 2 plates are colliding; associated with deep-sea trenches, volcanoes, and mountains
transform	boundary where 2 plates are sliding past one another; associated with faults and earthquakes
Wegener	man who came up with the theory of continental drift
Hess	man given credit for the theory of plate tectonics
basalt	rock that covers most of the ocean floor
Pangaea	name of the supercontinent 200 million years ago
continental drift	theory stating the continents used to be joined in a single land mass and have since drifted to their current locations
subduction	one tectonic plate is being forced under another tectonic plate
mid-ocean ridge	chain of underwater mountains
deep-sea trench	long, narrow depression on the ocean floor; occurs at convergent boundaries
plate tectonics	theory that the Earth's crust is broken into plates which move in different directions at different speeds
lithosphere	strong, rigid layer of Earth including the uppermost mantle and overlying crust
asthenosphere	a weak plastic-like layer of the mantle situated below the lithosphere; convection currents happen here
seafllor spreading	theory stating that new crust is made at mid-ocean ridges and old crust is destroyed at deep-sea trenches
rift valley	long narrow depression that forms when continental crust separates at a divergent boundary
fault	fracture in the Earth's crust; transform boundary