types of rock

Igenous

: rock formed from cooling magma or lava + undergoes crystallisation

• form from very hot molten rock. molten rock cools + harden into solid rock.

cooling take

●million years (dintrusive), or

●minutes or hours (, extrusive)

●slow cooling form large crystals (usually intrusive)

fast cooling forms small or glassy crystals (usually extrusive)

X blue.Extrus igneous rock form quickly on surface from lava. crystals= small from quick cooling

Igneous rock important

(extrusive) = surface

(intrusive) = below surface

Sed

forms from sediemnts

• Over millions years, mat at Earth surf = broken down into smaller pieces - form sediments in process = weathering

• sediments can move via erosion(Erosion is the natural process where wind, water, or ice wears away bits of rock and soil and carries them to a new place) x blue

As deposition of new sediments happen, - build up in layers

layers become sed rock via two process: compaction + cementation.

Compaction

New layers of sediment build up on top of older ones

Cementation

sediments stick together + harden

sed rock how made and only sed rock ?

rock made by sediments being cemented together

•Only sedimentary rocks contain fossils

metamorhpiuc

formed deep inside the Earth. created by extreme heat and pressure

• rock remaining solid with minerals rearranging + changing structure

forces tht change rocks

Weathering and erosion: rocks are broken down into smaller pieces.

Compaction and cementation: layers of sediment are pressed together to form sedimentary rock.

Heat and pressure: rock underground = changed into metamorphic rock w out melting

Melting:

improtant for test iamge