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 and inner core.

Question 4

tectonic plate

Answer 4

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

Question 5

the theory that continents gradually drift over to their present 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 current

Answer 7

the process in which the hotter parts of gas o liquid rises to the top and the cooler, denser parts sink.

Question 8

convert boundary

Answer 8

when two tectonic plates come together

Question 9

mountins

Answer 9

upflip of crustal plates that form elevated landmarks.

Question 10

volcanoes

Answer 10

a vent in the earths surface through which magma and gasses are expelled

Question 11

divergent boundary

Answer 11

when tectonic plates spit apart

Question 12

transform boundary

Answer 12

when tectonic plates slide past each other

Question 13

fault

Answer 13

breaks in the crust

Question 14

mid ocean ridge

Answer 14

a long ridge of underwater volcanoes between two diverging oceanic plates

Question 15

subduction zone

Answer 15

where one tectonic plate sinks under another plate

Question 16

rift valley

Answer 16

a long narrow valley between two diverging continental plates