THE RESTLESS EARTH UNIT 1 Q 3

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What are the 3 rock types?
Igneous , sedimentary + metamorphic
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How are igneous rocks formed?
Magma below the earths surface in molten rock. When it hardens it forms igneous rock.
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2 examples ?
Basalt or granite
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How are Sedimentary rocks formed?
Small particles of rock or dead plants/ animals are built up as sediment below sea . they are squeezed together to form rock
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2 examples
limestone or sand stone
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How are metamorphic rocks formed?
rocks changed by heat and pressure
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examples?
limestone changes to marble
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What 3 parts are the are the earth dived up by ?
crust , mantle + core
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what are convection currents?
How the plates move . The heat moves upwards then spreads out moving the plates
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What are the main plate movements?
Constructive, destructive and collison gone , conservative gone
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describe conservative
move apart - something is built - Mid atlantic
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descirbe destructive
moving together crusts destroyed usually oceanic to continental .
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describe collison gone
two continental plates move together to form mountains
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describe conservative gone
plates slide past and stick causing earthquakes - San Francisco
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What is the subduction zone?
The area that the oceanic plate goes below the continental plate to produce a deep ocean trench and when it sticks causes and earthquake
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How has the Giants causeway been formed?
cooling of basalt an igneous rock into 40000 columns
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How has the Antrim Plateau been formed?
A large area of high flat land where lava has seeped out of a large fissure.
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How has Slemish mountain in Co. Antrim been formed?
It is a volcanic plug. The rock cooled on top of the volcano and blocked the vent . The new rock is called dolerite.
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What is an earthquake?
A tremor starting in the crust which causes shaking to be felt on the earths surface
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what is the epicentre?
the first place on the earths surface to feel shockwaves from and earthquake . Directly above focus.
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What is the focus?
the ppint of origin on an earthquake
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What is liquefaction?
The process of solid soil turning to liquid mud caused by shaking during and earthquake bringing water to the surface
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What is a mid ocean ridge?
Where 2 plates made of oceanic crust move apart the magma of the mantle rises to fill the gap causing the crust to rise and form a ridge.
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What is the Richter scale ?
A scale between 0 and 9 which measures the strength of an earth quake
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What is a seismograph ?
an instrument designed to measure the energy realesed by an earthquake
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Other cards in this set

Card 2

Front

How are igneous rocks formed?

Back

Magma below the earths surface in molten rock. When it hardens it forms igneous rock.

Card 3

Front

2 examples ?

Back

Preview of the front of card 3

Card 4

Front

How are Sedimentary rocks formed?

Back

Preview of the front of card 4

Card 5

Front

2 examples

Back

Preview of the front of card 5
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