CBSE Class 7 Geography The External and Internal Face Of the Earth Worksheet

The External and Internal Face Of the Earth

Give answer to the following questions approximately in 1- 15 words

Question. How many shells of the earth are there? Name them.
Ans. There are three shells of the earth: - 1. Lithosphere (crust) 2. Mantle, 3. Core.

Question. How many types of rocks are found on the earth?
Ans. Basically, there are three types of rocks:-
1. Igneous 2. Sedimentary 3. Metamorphic

Question. Write down about the mantle part of the earth.
Ans. Below the upper layers of earth is Mantle. It is 2900 km deep. It is also called SIMA because of its’ main elements Silicon and Magnesium.

Question. Why the 'SIAL' layer is known by this name?
Ans. Lithosphere is called as SIAL. Because this layer contains mainly Silicon (SI) and Aluminium (AL) elements.

Question. By which name the innermost part of the earth called? What are the components of this part?
Ans. The innermost part of the earth is called ’Core’. The core known as NiFe, mainly consists of two elements Nickel (Ni) & Ferrous (Fe).

Question. How can we avoid soil erosion?
Ans. 1. By planting new trees 2. By adopting better agricultural practices 3. By checking over grazing etc.

Give answer to the following questions approximately in 50-60 words

Question. What are igneous rocks? How many types are there in these rocks? Write about the intrusive rocks.
Ans. ‘Igneous’ means fire. These rock are of two types:-1. Intrusive 2.Extrusive
These rocks are formed out of the cooling of the hot and liquid material from the interior of the Earth.
Intrusive Igneous rocks: - Rocks formed by the cooling of the Magma, in the interior of the earth are called as Intrusive Rocks.

Question. What are the sedimentary rocks? How many types are there of these rocks?
Ans. These rocks are formed by the hardening of the layers of the matter brought by agents of denudation (like water, air and river etc.).
There are three types of sedimentary rocks: - 1. Clastic 2. Chemical 3. Organic.

Question. Write about the metamorphic rocks, give specific example of these rocks.
Ans. As a result of the effect of temperature and pressure, igneous rocks and sedimentary rocks undergo a change in their form, structure and hardness. Such transformed rocks are called metamorphic rocks. Examples: - Marble, slate, coal etc.

Question. Classify the minerals available in the earth's crust.
Ans.
1.Metallic Minerals: Iron, Copper, Tin, Gold, Silver etc.
2. Non-Metallic Minerals: Sulphur, Mica, Potash etc.
3. Energy-Minerals: - Coal, Petroleum, Natural gas, Electricity etc.

Question. In which category Mica is classified? For what purpose is it used?
Ans. Mica is a non-metallic mineral. It is used in making electric goods. It is also used in making lamps, paints, radars, rubber, paper, aeroplanes etc.

Question. Which mineral is called as 'Liquid Gold'? Give brief introduction.
Ans. Petroleum is called as ‘Liquid Gold’. It is made out of the vegetation and animals trapped between layers of sedimentary rocks. It is refined in refineries before use.

Question. Write down the importance of the soil on the earth.
Ans. Fertile soil has always been very important for human civilizations. The fertile soils of Indus, Nile etc. led to the development of the civilizations. Even today high density of population is found in fertile river valleys and plains.

HISTORY

The Mughal Empire

Tribes, nomads and settled communities

Fill in the blanks :

1. In Punjab the _______________ tribe was very influential during the 13th and 14th century.

2. In the western Himalaya the shephered tribes of _______________ were lived.

3. _______________ was Akbar’s famous general who defeated Cheros in 1591.

4. The _______________ were the most important trader nomads.

5. In the 1662, the Mughal under _______________ attacked the Ahom kingdom.

6. Rani Durgawati ruled on behalf of their five year old son _______________.

7. Smaller castes or _______________ emerged within varnas.

8. Aman Das, the Gond raja of Garha Katanga assumed the title of _______________.

9. In the reign of _______________ in 1714 to 1744 Hinduism became more prominent religion.

10. _______________ carried grain on their bullocks from different areas and sold it in towns.