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The rock cycle (dhs)

Dhs science homework
by

andrew moffat

on 20 April 2010

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Transcript of The rock cycle (dhs)

Magma Magma is melted rock under the surface of
the earth, Lava is the extrusive version. Cooling The magma soon cools (crystalises)....... Igneous rock To form igneous rock. Weathering and erosion Water and wind will wear anything
down after time. as the rock gets worn
down the particles that taken off are carried away on the wind. These are called sediments. Lithification lithification is when sediments are
compacted under pressure. When this
happens they become solid rock
(called sedimentary rocks). Sedimentary rocks Sedimentary rocks are formed when
sediments are compressed under pressure. Metamorphic Rocks Metamorphic rocks are formed
when sedimentary rocks undergo
great heat or pressureand are
compressed even further. Melting Eventualy the rock get pushed
further towards the center of the
earth it heats up till it melts. Rock Summary Sedimentary Rocks Sediments settle at the bottom of rivers lakes and oceans. slowly over time the sediments are pressed down more and more until the bottom layers become rock.

Someuses of sedimantary rocks are for gravel and chalk for blackboards. Igneous Rocks Igneous rocks are simply cooled Lava/Magma.
Various igneous rocks can be used for hand soaps, emery boards constrcution and monuments Metamorphic Rocks Metamorphic rocks are usually
formed deep within the earth
subjected to extreme pressure
and heat.

They can be used for floor tiles, counter tops
and (slate) used to be used for blackboards.
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