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

continental drift theory

Answer 4

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

Question 5

astrhenosphere

Answer 5

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

Question 6

tectonic plate

Answer 6

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

Question 7

convection current

Answer 7

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

Question 8

convergent boundary

Answer 8

when two tectonic plates come together

Question 9

volcanoes

Answer 9

a vent or fissure in earths surface through which magma and gases are expelled

Question 10

mountains

Answer 10

uplift of crustal plates that form elevated landmasses

Question 11

transform boundery

Answer 11

when tectonic plates slide past each other

Question 12

drivergent boundary

Answer 12

when tectonic plates split apart

Question 13

mid-ocean ridge

Answer 13

along ride of underwater valcanoes between two diverging oceanic plates

Question 14

fault

Answer 14

breaks in the crust . the movement causes seismic waves which produces earth quakes

Question 15

rift valley

Answer 15

a long narrow valley between diverging continental plantes

Question 16

subduction zone

Answer 16

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