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Vocabulary
Volcanoes
Plate Tectonics
Landforms
Random
100
Melted rock that flows out onto Earth's surface is...
Lava
100
When a volcano collapses into itself at its top, it forms a...
crater
100
Earth's crust and upper mantle are broken into several...
plates
100

A large, tall, rocky area of land that comes up out of the Earth's surface. Usually due to convergent boundaries

Mountains

100

When one crust goes underneath another crust, this is called

subduction

200
Most of the magma from a volcano comes up through a rocky opening called a...
vent
200
An underground holding pool for hot magma is called a...
magma chamber
200
The plates of Earth's crust and mantle can NOT usually move... a)toward each other b) away from each other c)very slowly d)Very quickly
very quickly
200

When two oceanic plates converge they form a ______ at the bottom of the ocean floor

trench

200

When new land is formed under the sea, this is called

seafloor spreading

300
Hot melted rock that is underground is called...
magma
300
A large basin that can form at the top of a volcano is a...
crater
300

When two plates move horizontally past one another

Transform boundaries

300

a long stretch of mountains.

mountain range

300

Scientists think continents were once a large single landmass that broke apart and then the continents slowly DRIFTED to their present locations. What is the name given to this hypothesis?

Continental Drift

400

Wegener called the large landmass

Pangea

400

A mountain that forms from lava is a ...

volcano

400

When two tectonic plates collide with one another, causing subduction and or mountain building

Convergent Boundaries

400

these form when magma rises into the gap between diverging plates. They thus occur at or near actual plate boundaries

rift valleys

400

An underground holding pool for hot magma is called a...

Hot mantle plume/ magma chamber

500

What causes the plates to move?

convection currents

500
Name one of two places where a volcano is most likely to form.
where plates move toward each other, in the ocean where plates are moving away from each other.
500

When two plates move away from one another

Divergent Boundary

500

an underwater mountain system with a rift or valley.

an ocean ridge

500

What else did Wegener find to help bring evidence for his theory?

fossils and rock layers