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1. The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock.
Igneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals. The minerals can form crystals when they cool. Igneous rock can form underground, where the magma cools slowly. Or, igneous rock can form above ground, where the magma cools quickly.
2.The earth consists of three concentric layers namely Crust, Mantle, and Core. Below is the description of each layer individually.
1. Crust = It is the outer layer of the earth. It is a thin layer between 0-60 km thick. The crust is the solid rock layer upon which we live.
2. Mantle = It is the widest section of the Earth. It has a thickness of approximately 2,900 km. The mantle is made up of semi-molten rock called magma. In the upper parts of the mantle, the rock is hard, but lower down the rock is soft and beginning to melt.
3. Core = It is in the center and is the hottest part of the Earth. It consists of two parts namely the inner core (made up of iron, steel etc) and the outer core (liquid layer).
The figure below shows the labelled diagram of the structure of the earth.
3. The solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil.
Igneous rocks may be simply classified according to their chemical/mineral composition as felsic, intermediate, mafic, and ultramafic, and by texture or grain size: intrusive rocks are course grained (all crystals are visible to the naked eye) while extrusive rocks may be fine-grained (microscopic crystals) or glass (no crystalline structure; i.e., no minerals). Volcanic rocks, especially felsic and intermediate, often have a porphyritic texture characterized
Explanation:
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