End of year 9 exam 1 Flashcards

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1
Q

what is a Tectonic plate

A

large section of the Earth’s crust.

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2
Q

Plate Tectonics

A

the theory concerning the structure of the earth and the processes
occurring which explain the configuration of the continents and
the location of earthquakes and volcanic activity.

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3
Q

Destructive plate boundary

A

a plate boundary where the plates move towards each other and
where one is subducted beneath the other and so is destroyed as
it returns to the mantle.

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4
Q

Constructive plate
boundary

A

a plate boundary where the relative movement of the crustal
plates is apart from each other allowing magma to rise from the
mantle and solidify to construct new crust.

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5
Q

Conservative plate
boundary

A

where the two crustal plates try to move past one another.

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6
Q

Collision plate boundary

A

where two continental plates move towards each other.

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7
Q

Epicentre

A

point in the surface directly above the focus of an earthquake.

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8
Q

Focus

A

the actual point within the crust where the energy was released.

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9
Q

Seismic waves

A

waves of energy released by an earthquake

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10
Q

Seismometer

A

an instrument used to detect and record seismic waves.

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11
Q

Richter Scale

A

measures the energy released during an earthquake. Runs from 1
to 10 on a logarithmic scale i.e. each level increase is 10x stronger

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12
Q

Tsunami

A

a large wave(s), caused when an earthquake displaces the water
above

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