NCERT Solutions for Class 7 Social Science Geography Chapter 2 Inside our Earth are part of NCERT Solutions for Class 7 Social Science. Here we have given NCERT Solutions for Class 7 Social Science Geography Chapter 2 Inside our Earth.
|Subject||Social Science Geography|
|Chapter Name||Inside our Earth|
|Number of Questions Solved||7|
NCERT Solutions for Class 7 Social Science Geography Chapter 2 Inside our Earth
NCERT TEXTBOOK EXERCISES
Answer the following questions.
- What are the three layers of the earth?
- What is a rock?
- Name three types of rocks.
- How are extrusive and intrusive rocks formed?
- What do you mean by a rock cycle?
- What are the uses of rocks?
- What are metamorphic rocks?
1. The three layers of the earth are:
2. A rock is a natural mass of mineral matter that makes up the earth’s crust.
Rocks can be of a different colour, size, and texture.
3. Three types of rocks are:
- Igneous rocks also known as primary rocks.
- Sedimentary rocks.
- Metamorphic rocks.
4. When the molten lava comes on the earth’s surface, it rapidly cools down and becomes solid. Rocks formed in this way on the crust are extrusive igneous rocks. Sometimes the molten magma cools down deep inside the earth’s crust. Solid rocks so formed are actually intrusive igneous rocks.
5. One type of rock changes to another type under certain conditions in a cyclic manner. This process of transformation of the rock from one to another is known as the rock cycle. Let’s understand it through example—Igneous rocks change into sedimentary rocks. When the igneous and sedimentary rocks are subjected to heat and pressure, they change into metamorphic rocks. The metamorphic rocks which are still under great heat and pressure meet down to form molten magma. This molten magma again can cool down and solidify into igneous rocks.
6. Hard rocks are used for making roads, houses, and buildings. Stones are used in many games, such as seven stones (pitthoo), hopscotch (stapu/kit kit), Five stones (gitti).
7. When the igneous and sedimentary rocks are subjected to heat and pressure they change into metamorphic rocks. For example, clay changes into slate and limestone into marble.
Tick the correct answer.
(i) The rock which is made up of molten magma is
(ii) The innermost layer of the earth is
(iii) Gold, petroleum, and coal are examples of
(iv) Rocks which contain fossils are
(a) Sedimentary rocks
(b) Metamorphic rocks
(c) Igneous rocks
(a) Sedimentary rocks
(v) The thinnest layer of the earth is
Match the following.
(i) Core (a) Earth’s surface
(ii) Mineral (b) Used for roads and buildings
(iii) Rocks (c) Made of silicon and alumina
(iv) Clay (d) Has the definite chemical composition
(v) Sial (e) Innermost layer
(f) Changes into slate
(g) Process of transformation of the rock
(i) Core (e) Innermost layer.
(ii) Mineral (d) Has definite chemical composition.
(iii) Rocks (b) Used for roads and buildings.
(iv) Clay (a) Earth’s surface
(v) Sial (c) Made of silicon and alumina.
- We cannot go to the center of the earth.
- Sedimentary rocks are formed from sediments.
- Limestone is changed into marble.
1. To reach the centre of the earth one will have to dig a hole 6000 km. deep on the ocean floor. This is quite impossible and therefore we cannot go to the centre of the earth.
2. Rocks break down into small fragments known as sediments. These sediments are transported and deposited by wind, water, etc. These loose sediments are compressed and hardened to form layers of rocks known as sedimentary rocks.
3. Limestone is changed into marble because igneous and sedimentary rocks change into metamorphic rocks under great heat and pressure.
(i) What are the minerals most commonly used in the following objects?
(ii) Identify some more objects made up of different minerals.
- Karhai – Iron
Bell – Brass
Ornaments – Gold
Pan/Tava – Iron
Hammer – Iron
Lamp – Brass
Other more things, utensils (steel, brass, copper, aluminium) Furniture (iron), windows (iron, glass, aluminium).
INTEXT QUESTIONS WITH THEIR ANSWERS
Collect pictures of some monuments and find out which are the rocks used to build them. Two pictures have been collected for you. (NCERT Page 9)
- The Taj Mahal is made of white marble.
- The Red Fort is made of red sandstone.
What are the minerals found in your state? (NCERT Page 10)
- No minerals are found in our state, Delhi, (National Capital Territory of Delhi).
- Only Badarpur and stone are extracted from Bhati mines.
Jharkhand: Following minerals are mainly found in my state:
- Iron Ore
- Aluminium (Bauxite)
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