Inside our Earth - Worksheets

 CBSE Worksheet 01

Inside our Earth

  1. Match the following
    Stone
    (a) Five stone
    (b) Seven Stone
    (c) Hop Scotch
    Name of the game
    (1) Gitti
    (2) Pitthoo
    (3) Stapu

    1. (a)-(3), (b)-(1),(c)-(2)
    2. (a)-(1), (b)-(2),(c)-(3)
    3. (a)-(3), (b)-(2),(c)-(1)
    4. (a)-(1), (b)-(3),(c)-(2)

  2. The oceanic crust is mainly called

    1. sima
    2. sile
    3. sial
    4. nife
  3. Deccan plateau is made up of
    1. Nickel rocks
    2. Alumina rocks
    3. Graphite rocks
    4. Basalt rocks
  4. Rocks used for building materials are
    1. granite, sugar, sandstone, slate,
    2. granite, basalt, sandstone, slate, limestone
    3. granite, basalt, limestone, sugar, slate,
    4. granite, sandstone, sugar, limestone
  5. The innermost layer of the earth is
    1. Crust
    2. Mantle
    3. Sima
    4. Core

  6. Match the following:

    (a) Core(i) Granite
    (b) Pitthoo(ii) Innermost layer 
    (c) Grinding stone(iii) Sedimentary rock
    (d) Sandstone(iv) Seven stones 
  7. Fill in the blanks:

    Any natural mass of mineral matter that makes up the ________ is called a rock.

  8. Basalt is a metamorphic rock.

  9. Name the main mineral constituent of the continental mass.

  10. Name the constituents of the oceanic crust.

  11. What are minerals? How are they useful for mankind?

  12. What are sedimentary rocks? Give an example.

  13. Mention various types of rocks

CBSE Worksheet 01
Inside our Earth

Solution

  1. (b) (a)-(1), (b)-(2),(c)-(3) Explanation: (1) Gitti is five stone game.

    (2) Pitthoo is played with seven stones.
    (3) Stapu is the other name of hopscotch.

  2. (a) sima Explanation: The oceanic crust is mainly called sima.
  3. (d) Basalt rocks Explanation: Deccan plateau is made up of basalt rocks.
  4. (b) granite, basalt, sandstone, slate, limestone Explanation: Rocks used for building materials are granite, basalt, sandstone, slate, limestone.
  5. (d) Core Explanation: The innermost layer of the Earth is Core.

  6. (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)

  7. Earth’s crust

  8. False

  9. Silica and alumina.

  10. Silica and magnesium.

  11. Minerals :

    Minerals are naturally occurring substances which have certain physical properties and definite chemical composition.

    Minerals are very useful for mankind: 

    A. Some minerals like coal, natural gas and petroleum are used as fuels.

    B. They are also used in industries. Iron, aluminium, gold, uranium, etc. are used in medicine, in fertilizers, etc.

    1. Sediments formed due to roll down of rocks are transported and deposited by wind, water, etc.
    2. These loose sediments are compressed and hardened to form layers of rocks.
    3. These types of rocks are called sedimentary rocks. For example, sandstone made from grains of sand.
    4. These rocks may even contain fossils of plants, animals and other micro-organisms that lived once on them.

  13. Rocks are of the three types:

    1. Igneous rocks

    2. Sedimentary rocks

    3. Metamorphic rocks

    1. Igneous rocks:  When the molten magma cools, it becomes solid. Rocks formed in this way are called igneous rocks. They are also called primary rocks. They arc of two types-intrusive rocks and extrusive rocks.

    (a) Extrusive rocks:  When molten lava comes on the earth's surface, it rapidly cools down and becomes solid. Rocks formed in this way on the crust are called extrusive igneous rocks. For example, basalt.

    (b) Intrusive 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. For example, granite.

    2. Sedimentary rocks: Small fragments of rocks are called sediments -These sediments are transported and deposited by wind, water, etc. These loose sediments are compressed and hardened to form sedimentary rocks. For example, sandstone is made from grains of sand.

    3. Metamorphic rocks: When igneous and sedimentary rocks are subjected to great heat and pressure they change into metamorphic rocks, For example, clay changes into slate and limestone into marble.