Making and types of rocks
Rocks can be found all around world, in seaside cliffs, hillsides, mountains, buildings, in roads. They are the hard solid part that makes up the earth. They can also be found in the depth of oceans and sea and under the ice in glacial areas. There are three types of rocks. Igneous rocks, sedimentary rocks and metamorphic rocks.
Igneous rocks makes from a hot liquefied mass of rocky material which are known as magna. Magma comes up from the deep surface of earth with a force through earth’s outer layer. Some time it flows with lava when a volcano bursts and after cooling it turns into rocks and their shapes remains same as it gets after cooling and it depend on the kind of magna where it cools and how much time it takes to cool down. The size also depends on the time the magna takes to cool. These are the rocks which are being called igneous rocks. Granite is a form of igneous rock. It consists of hornblende, feldspar, mica and mineral quartz.
Sedimentary rocks are made of soft and moving sand and mud found in the bottom of rivers and lakes. Mudstone, sandstone and limestone are form of sedimentary rocks. They are the composition of erosion and deposition that take place at every time. These rocks on land get broken because of the act of wind, ice water and plant roots and wash away into sea and river. In years million of grains have been deposited in land or sea water and form into layers in water and on lands. They also get `formed with the long deposited material of plant and animals. In sea skeleton and bones of animal’s turns into rocks and on land the roots of plants form beds of peat and coal. Limestone is an example of sedimentary rocks. They gets turned into rock in two procedures first is to gets squeezed hard with the sand and mud and water runs out of them. The mineral formed crystals fill the space with had been emptied between rocky grains.
Metamorphic rocks have been made through heating and pressure, these both process make actual rocks to change themselves into metamorphic rocks. Magna is the reason for these rocks. When magna force up its way out of earth if it pass a sandstone, it converts in to this type of rock. Limestone can for a marble after getting baked in this process which is called meta morphisms. This process only affect small rocks. Large-scale metamorphism can make mountains. Diamond is the greater example metamorphism.
