Rocks are aggregates of one or more minerals found in the Earth's crust and are classified into three types: igneous, sedimentary, and metamorphic. Igneous rocks form from the cooling of molten material and are considered primary, while sedimentary rocks arise from the compaction of sediments and are termed secondary. Metamorphic rocks are formed from changes to either igneous or sedimentary rocks without weathering, and can also undergo further metamorphosis.

1. BY- GEOLOGICA
ROCKS
(A GENERAL INTRODUCTION)

5. WHAT IS ROCK ?
The materials of the earth`s crust
or lithosphere are generally
called as rocks.
Or
Rocks are the aggregates of one or
more than one minerals.

6. CLASSIFICATION OF ROCKS
ROCKS
IGNEOUS ROCKS
SEDIMENTRY ROCKS
METAMORPHIC ROCKS

7. IGNEOUS ROCKS
• The igneous rocks are formed due to cooling , solidification
and crystallization of hot and molten Material known as
magmas and lavas.
• Igneous rocks are also termed as primary rocks because
these were originated first of all the rocks.
• All the subsequent rocks are formed , weather directly or
indirectly, from igneous rocks , that`s why these are also
called parent rocks.

9. SEDIMENTRY ROCKS
• The sedimentary rocks are formed due to aggregation and
compaction of sediments.
• Sedimentry rocks are also called as stratified or layered
rocks because these rocks have different type of sediments.
• Sedimentry rocks are called as secondary rocks.

13. METAMORPHIC ROCKS
• The metamorphic rocks include rocks that have been
changed either in form or composition without weathring.
• Metamorphic rocks are generally formed due to changes in
form of sedimentry and igneous rocks.
• Sometimes , even previously formed metamorphic rocks are
again metamorphosed.

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