Rock refer to the combination of different materials. Rock can be classified according to their formation (origin)
TYPES OF ROCK
1. Igneous rocks
2. Sedimentary rocks
3. Metamorphic rocks
1. IGNEOUS ROCKS
These are rocks which formed through the process of solidification and compacted of molten material called Magma either within or outside the earth crust.
*Why Igneous rocks refers to the mothers rock?
1. The other rock it's owe their origin
2. Formation of soil fertilite
3. It's not originated from another rock it made up itself
Characteristic of Igneous rocks
1.They do not occur in layer
2. Most of them are crystalline
3. They do not contain fossils
4. The origin of another rock
2. SEDIMENTARY ROCK
These rock are formed after accumutation of deposited material of rock and compacted together.The process of formating this rock is called sedimentation
It occur after accumutation of sediment material and compacted together and cementation.
The rock cycle
Characteristic of sedimentary rock
1. They are non crystalline
2. Sometimes contain fossils
3. Are found in layer
4. Originated from igneous rock
*Due to the mode of formation sedimentary rock are formed in three process like this below
1. Mechanically formed
Formed by accumutation of material deriven from other rock which have been cemented together eg.sandstone
2. Organically formed
Formed due to remains of plants and animals eg.chalks and coal
3. Chemically formed
Formed through chemical precipitation of solution eg.rocks, salts.
3. METAMORPHIC ROCK
These rock are formed when Igneous and Sedimentar rock are subjected to heat and pressure then rock change their appearance and chemical properties
IMPORTANT OF ROCK FOR HUMAN
1. Construction activities
2. Minerals activities
3. Tourism activities
4. Formation of soil fertilite
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