Plate tectonics

Question 1

crust

Answer 1

the outermost shell of a rocky planet

Question 2

mantle

Answer 2

the layer of molten rock between the crust and the core

Question 3

core

Answer 3

made up of mostly iron. separated into 2 parts the outer and the inner core

Question 4

tectonic plates

Answer 4

the layer of rock that makes up the outer part of the earth, including the crust and the upper mantle. (lithospheric plates)

Question 5

continental drift theory

Answer 5

the theory that continents gradually drift over time to their current positions

Question 6

asthenosphere

Answer 6

a thin layer of earth, about 150 miles thick, at the border between the mantle and the crust.

Question 7

convection currents

Answer 7

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

Question 8

convergent boundary

Answer 8

when two tectonic plates come together.

Question 9

mountains

Answer 9

uplift of crustal plates that form elevated landmasses

Question 10

volcano

Answer 10

a vent or fissure in the earth’s surface through which magma and gasses are expelled

Question 11

divergent boundary

Answer 11

when tectonic plates split apart

Question 12

transform boundary

Answer 12

when tectonic plates slide past each other

Question 13

Fault

Answer 13

breaks of crust. the movement causes seismic waves which produce earthquakes

Question 14

mid-ocean ridge

Answer 14

a long ridge of underwater volcanoes between two diverging oceanic plates

Question 15

subduction zone

Answer 15

a place where one tectonic plate sinks under another and melts. also forms a trench

Question 16

Rift valley

Answer 16

a long narrow valley between 2 diverging continental plates