geography revision

What is a constructive plate boundary?

the tectonic plates are moving away from one another.

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What is a destructive plate boundary?

when oceanic and continental plates move together

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What is a volcano? What are the layers of the
earth called?

A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. The crust of the Earth is made of tectonic plates. These plates float around on

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What happens at a conservative plate
boundary?

Pressure builds up because the plates are still trying to move

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Why do earthquakes happen?

Earthquakes are the result of sudden movement along faults within the Earth.

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What are the effects of a volcano?

Several hazards may affect the area around the volcano, such as lava flows, pyroclastic flows, lahars, jökulhlaups and landslides or debris avalanches.

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Why do volcanoes and earthquakes happen at
plate boundaries?

The plates rip apart at divergent plate boundaries, crash together at convergent plate boundaries, and slide past each other at transform plate boundaries.

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Why do plates move?

Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents.

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Explain the differences between the layers of the
earth

Crust: the outer layer of rock on which humans and animals live and plants grow. Mantle: a semi-solid magma layer consisting of iron, magnesium, and silicon. Core: centrally located solid mass of metal (inner core) and a liquid mass of iron and nickel (ou

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Compare the oceanic plate and the continental
plate

Oceanic plates make up the ocean floor. Continental plates make up the continents.

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geography revision

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