plate tectonics

Question 1

crust

Answer 1

the outermost shell of a rocky planet.

Question 2

mantle

Answer 2

layer of molten rock between the crust and core.

Question 3

core

Answer 3

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

Question 4

tectonic plate

Answer 4

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

Question 5

continental drift theory

Answer 5

the theory that continents gradually drift over time to their present positions.

Question 6

asthenosphere

Answer 6

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

Question 7

convection current

Answer 7

the process in wich the hotter parts of a gas or liquid rise to the top and the 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

volcanoes

Answer 10

a vent or fissure in earths surface through wich magma and gasses are expeled.

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 in the crust. the movement causes seismic waves wich produces earthquakes

Question 14

mid-ocean ridge

Answer 14

a long ridge of underwater valcanoes between two diverging oceanic platessubduction zone

Question 15

subduction zone

Answer 15

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

Question 16

rift valley

Answer 16

a long narrow valley between two diverging continental plates.