West Bengal Class 8 English Medium Geography Solution Chapter 1 Interior of the Earth
On this Page we have given West Bengal Class 8 English Medium Geography Solution Chapter 1 Interior of the Earth Question and Answer for our Students of West bengal Class 8 English Medium. Hope this following Question Answer will help our Students.
Q.1. MCQ’s.
1.) Radius of the earth is .
a.) 5210 km
b.) 5550 km
c.) 6370 km
d.) 6870
Answer:- c. 6370 km
2.) The world’s deepest mine located in .
a.) South Africa
b.) South America
c.) Both a and b
d.) None of these
Answer:- a. South America
3.) Hot molten lava comes out from the volcanoes in form.
a.) Semi solid
b.) Solid
c.) Liquid
d.) Semi liquid
Answer:- d. Semi liquid
4.) Average density of the earth surface is .
a.) 2.6 to 33 gram/cubic cm
b.) 5.6 to 45 gram / cubic cm
c.) 6.5 to 55 gram/ cubic cm
d.) None of these
Answer:- a. 2.6 to 33 gram/cubic cm
5.) The base of the ocean consists mainly of .
a.) chloride(cl)
b.) magnesium (Mg)
c.) silicon (Si) and magnesium (Mg)
d.) silicon (Si)
Answer:- c.silicon (Si) and magnesium (Mg)
6.) lies at the top of the crust.
a.) Soil
b.) Water
c.) Minerals
d.) Air
Answer:- a. Soil
7.) Greater part of crust consist of .
a.) Nitrogen
b.) Hydrogen
c.) Oxygen
d.) All of these
Answer:- c. Oxygen
8.) _____ is formed of earth crust and upper part of the mantle.
a.) Asthenosphere
b.) Lithosphere
c.) Crofesima
d.) Nifesima
Answer:- Asthenosphere
Q.2. Short answer.
1.) What is magma?
Answer:- Due to enormous pressure and temp- erature the substance of the earth’s interior remain liquid, being mixed with gas and vapour is called magma.
2.) Define lava.
Answer:- When hot molte magma of the earth interior, comes out through the cracks and joints on the earth surface, it is called lava.
3.) What is density?
Answer:- Density of a matter is its mass per unit volume.
4.) What is uppermost of the crust composed of?
Answer:- The uppermost of the crust is mainly composed of granite.
5.) Define lithosphere.
Answer:- Lithosphere is formed of earth crust and upper part of the mantle. It is nearly 100km deep.
6.) Define asthenosphere.
Answer:- The definite layer that lies on the upper part of the mantle beneath the crust is known as asthenosphere.
7.) What is inner core?
Answer:- The layer that lies surrounding the centre of the earth is known as inner core. It is nearly 5100 km to 6370 km deep.
8.) Define core.
Answer:- The innermost layer which encircles the centre of the earth is known as the core. It is almost 3500 km.
9.) What lies between mantle and core?
Answer:- Gutenberg Discontinuity lies between mantle and the core.
10.) What separates inner and outer core?
Answer:- Lehman Discontinuity separates inner and outer core.
Also See: West Bengal State Board English Medium Class 8 History Solution