science and engineering practices

Question 1

crust

Answer 1

The outermost shell of a rocky planet.

Question 2

Mantle

Answer 2

layer molten rock between the crust and core.

Question 3

core

Answer 3

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

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 (lithospheric plates)

Question 5

Continental drift theory

Answer 5

The theory the continents gradually drifted 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 mantle and the crust.

Question 7

convection current

Answer 7

the process in which 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

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

Question 11

divergent boundary

Answer 11

when tectonic plates slit apart.

Question 12

Fault

Answer 12

Breaks in the crust. The movement cuses sismic waves which produces earthquakes.

Question 13

mid-ocean ridge

Answer 13

a long of underwater volcanoes between two diverging oceanic plates.

Question 14

subduction zone

Answer 14

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