Tectonic Plates

Question 1

continental crust

Answer 1

30-50km, less dense, lighter, older

Question 2

oceanic crust

Answer 2

5-10km, more dense, heavier, younger

Question 3

convection current

Answer 3

core’s heat causes magma to rise, current flows underneath causing side ways pressure = plate move apart. Magma cools = sinks to outer core

Question 4

ridge push and pull

Answer 4

magma rises with convection currents, rising through crust gaps at ocean ridge. Cools = new mid-ocean ridge. Becomes denser = sinks away from ridge. Oceanic crust sinks to mantle

Question 5

destructive

Answer 5

plates meet, oceanic subducts

Question 6

constructive

Answer 6

plates move away, magma rises, shield volcanoes

Question 7

collision

Answer 7

2 plates of same density meet, no subduction, fold mountain ranges, no volcanoes

Question 8

conservative

Answer 8

2 plates move past each other or in the same direction at different speeds, powerful earthquakes, no volcanoes