Section 1

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Asthenosphere

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Last updated

6 years ago

Date created

Mar 1, 2020

Cards (19)

Section 1

(19 cards)

Asthenosphere

Front

The soft layer of the mantle on which the tectonic plates move

Back

Pyroclast

Front

fragment of rock formed by volcanic explosion

Back

seafloor spreading

Front

The process that creates new sea floor as plates move away from each other at the mid-ocean ridges

Back

plate tectonics

Front

The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.

Back

crater

Front

A bowl-shaped area that forms around a volcano's central opening

Back

Magma

Front

Molten rock beneath the earth's surface

Back

The angle of repose

Front

the steepest angle at which loose material remains stationary without sliding downslope

Back

ash cloud

Front

a cloud of ash that forms in the air after some volcanic eruptions

Back

pyroclastic flow

Front

the flow of ash, cinders, bombs, and gases down the side of a volcano during an explosive eruption

Back

Main Vent

Front

the weak point in the Earth's crust where hot magma rises from the magma chamber and reaches the surface.

Back

volcanic bombs

Front

A projectile of hot magma or rock that is blown from the vent during a volcanic eruption. These solidify in flight and frequently form an elongated rock of streamlined shape.

Back

Secondary vent

Front

Magma can reach the surface in other areas

Back

convection current

Front

the movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another

Back

magma chamber

Front

the pocket beneath a volcano where magma collects

Back

Continental Drift Theory

Front

the idea that continents slowly shift their positions due to movement of the tectonic plates on which they ride

Back

Caldera

Front

a large crater caused by the violent explosion of a volcano that collapses into a depression

Back

Lava

Front

Magma that reaches Earth's surface

Back

Lithosphere

Front

the rigid outer part of the earth, consisting of the crust and upper mantle.

Back

Secondary cone

Front

Lava builds up here in the shape of a cone

Back