plate tectonics

Question 1

crust

Answer 1

the outermost shell of a rocky planet

Question 2

mantle

Answer 2

layer of molten rocck between the crust and core

Question 3

continental drift theory

Answer 3

the theory that continents gradually drifted over time to their present positions

Question 4

core

Answer 4

made up mostly of iron separated into the outer core (molten) and inner core (solid)

Question 5

asthenosphere

Answer 5

a thin layer of earth about 150 miles thick at the border betweeen the mantel and the crust

Question 6

convection current

Answer 6

the process in which the hotter parts of a gas or liquid rise to the top and the cooler denser parts sink

Question 7

convergent boundary

Answer 7

when two tetonic plates come together

Question 8

mountains

Answer 8

uplift of crustal plates that form from elevated landmasses

Question 9

volcanoes

Answer 9

a vent in earths surface which magma and gases are expelled

Question 10

divergent boundary

Answer 10

when tetonic plates split apart

Question 11

fault

Answer 11

breaks in the crust the movements causes seismic waves which produces earthquakes

Question 12

subduction zone

Answer 12

a place where one tectonic plate sinks under another and melts

Question 13

mid ocean ridge

Answer 13

a long ridge of underwater volcanoes between two diverging oceanic plates