Sedimentary rocks are formed by the deposition of material on the earth's surface or in bodies of water, and make up around 8% of the earth's crust by volume. Intrusive igneous rocks form underground from magma that cools and solidifies within the surrounding country rock, resulting in coarse-grained textures. Metamorphic rocks comprise a large part of the earth's crust and form under high temperatures and pressures, being classified by their textures and mineral assemblages.

1. Mathew Sweeden
Life Skills
Sedimentary Rock
Sedimentary rocks are types of rock that are formed by
the deposition of material at the earth's surface and within
bodies of water.
The sedimentary rock corer of the continents of the
earth's crust is extensive but the total contribution or
sedimentaryrocks is estimated to be only 8% of the total
volume of the crust.

2. Igneous Rock
Intrusive igneous rocks are formed from magma that
cools and solidifieswithin the crust of a planet surroundedby
Pre-existing rock called country rock the magma cools slowly
and as result these rocks are coarse grounded.
Igneous rock is the product cooed solidified magma/lava.
As magma/lava cools it goes through the process of
crystallization which makes it turn into a igneous rock.

3. Metamorphic Rock
Metamorphic rocks make up a large part of the earth's
crust and classified by texture and by chemical and minerals
assemblage the temperatures greater than 150 to 100c and
pressure.