ROCKSRocks are the composition of silt , sand , minerals and other chemical substances .

There are three types of rocks –Igneous RocksSedimentary RocksMetamorphic Rocks

Igneous rock Sedimentary rock

Metamorphic rock

IGNEOUS ROCKSIgneous rocks are primary rocks .Igneous rocks are originally formed by the volcanic eruption .The solidification of molten magma on the surface of the earth gradually cools down and form hard rock called igneous rocks .For example –Granite , basalt

Andesite Basalt

Diorite Gabbro

Pegmatite Peridotite

ObsidianGranite

Scoria

Pumice

Tuff

Rhyolite

SEDIMENTARY ROCKSSedimentary rocks are formed from the igneous rocks .The igneous rocks got eroded by the natural agents like sun light , wind , water , etc . It will be broken into small pieces .In the next stage the broken particles carried and transport to other places and submit gradually one after another . with the result the layered rocks formed sedimentary rocks .For example –Limestone , sandstone , clay etc .

sedi

a Breccia

Coal a

Conglomerate a

Chert a

FlintDolomiteaaa

Iron OreLimestone

sediaaaaRock Salt

Sandstone

Shale Siltstone

METAMORPHIC ROCKSMetamorphic rocks are formed from the sedimentary rocks .Metamorphic means change of the face structure and shape .They are shinning in nature .For example –Quartzite , marble

meta

aAmphiboliteaa

Gneiss

HornfelsMarble

meta

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Novaculite Phyllite

Quartzite Schist

metaaa

SlateSoapstone

General Features Of RocksVery hard in nature .It will be powdered when it will be breaked .Sedimentary rocks will come out as layers .Petrology is the science of studying rocks .

Rock CycleRock cycle refers to the changing of or transformation of the shape , structure and shinning is called rock cycle .The rock cycle develops from magma to igneous rocks.From igneous rocks to sedimentary rocks .From sedimentary rocks to metamorphic rocks .And from metamorphic rocks to magma .