1. Answer the following questions.
(i) What are the three layers of the earth?
(ii) What is a rock?
(iii) Name three types of rocks.
(iv) How are extrusive and intrusive rocks formed?
(v) What do you mean by a rock cycle?
(vi) What are the uses of rocks?
(vii) What are metamorphic rocks?
Answers
Answer:
1. The three layers of the earth are crust , mantle and core.
2. A rock is any naturally occurring solid mass or aggregate of one or more minerals. Such aggregate constitute the basic unit of which the solid earth is composed and typically form recognizable and mappable volumes.
3.The three types of rocks are : igneous rocks, sedimentary rocks and metamorphic rocks.
4. Extrusive rocks are formed on the surface of the earth from lava , which is magma that emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.
5. Rock cycle is a process in which rocks are continuously transformed between the three types of rock .
6. helps in making roads , used to construct houses and buildings , used for playing games by children.
7.The type of rocks formed when igneous and sedimentary rocks experience heat and pressure is called matamorphic rocks
Answer:
(1) The three layers of the earth are the crust ,the mantle and the core.
(2) Any mass of harder portion of the earth's crust can be called a rock. A rock can be defined as an aggregate of minerals.
(3) The three types of rocks are igneous rocks, sedimentary rocks and metamorphic rocks.
(4) The extrusive rocks are formed when the solidification of lava takes place on the surface of the earth.
The instrusive rocks are formed when the magma solidifies below the surface of the earth.
(5) Rocks forming the crust of the earth change from one type to the other due to various processes. This change of rocks from one type to the other is called rock cycle.
(6) The uses of rocks are:-
• The rocks provide parent material for the soils.
• The rocks contains a variety of minerals.
• A number of rocks are used as a building materials for the construction of houses, roads and dams.
(7) Metamorphic rocks are formed through the process of metamorphism. The term metamorphism means alteration or transformation.
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