what is a rock and explain different types of rocks....?
Answers
The outer most layer of the earths surface is knows as lithosphere. These lithosphere mostly comprises solid materials which is known as a rock.
The rock is defined as an aggregate of one or more minerals. The rocks are mainly divided into three types such as..
1. Igneous rocks
2.sedimentary rocks
3. Metamorphic rocks.
1.Igneous rocks... These igneous rocks are mainly formed due to solidification of magma or lava. Igneous rocks are also knows as primary rocks. They don't show any stratification they are also called as unstratified rocks..
2.sedimentary rocks... The rocks which are formed due to the compaction and consolidation of the weathered sediments, which are deposited ina particular region that means these rocks are the products of weathering, erosion, denudation..
3.Metamorphic rocks..
These rocks are mainly formed due to a complex process known as metamorphism. These metamorphism involves high temperature and high pressure. Due to these process the physical and chemical properties of the rocks are completely changed and forms in to a new type of rocks which are known as metamorphic rocks. whenever the igneous rocks and sedimentary rocks are subjected to metamorphism they will give new type of rocks known as metamorphic rocks....
hope it helps you
answer:
The earth’s crust is made up of various types of rocks.
Any natural mass of mineral matter that makes up the
earth’s crust is called a rock. Rocks can be of different
colour, size and texture.
There are three major types of rocks: igneous rocks,
sedimentary rocks and metamorphic rocks.
When the molten magma cools, it becomes solid.
Rocks thus formed are called igneous rocks. They are
also called primary rocks. There are two types of igneous
rocks: intrusive rocks and extrusive rocks.
Can you imagine lava coming out from the volcanoes?
Lava is actually fiery red molten magma coming out from
the interior of the earth on its surface. When this molten
lava comes on the earth’s surface, it rapidly cools down
and becomes solid. Rocks formed in such a way on the
crust are called extrusive igneous rocks. They have a
very fine grained structure. For example, basalt. The
Deccan plateau is made up of basalt rocks. Sometimes
the molten magma cools down deep inside the earth’s
crust. Solid rocks so formed are called intrusive igneous
rocks. Since they cool down slowly they form large
grains. Granite is an example of such a rock. Grinding
stones used to prepare paste/powder of spices and grains
are made of granite.
Rocks roll down, crack, and hit each other and are
broken down into small fragments. These smaller particles
are called sediments. These sediments are transported
and deposited by wind, water, etc. These loose
sediments are compressed and hardened to form
layers of rocks. These types of rocks are called
sedimentary rocks. For example, sandstone is
made from grains of sand. These rocks may also
contain fossils of plants, animals and other micro-
organisms that once lived on them.
Igneous and sedimentary rocks can change
into metamorphic rocks under great heat and
pressure For example, clay changes into
slate and limestone into marble.