NCERT Solutions for Chapter 2 Inside Our Earth Class 7 Geography
Book Solutions
1(i)
Answer
1(ii)
Answer
Any natural mass of mineral matter that makes up the earth’s crust is called a rock.1(iii)
Answer
The three types of rocks are igneous rocks, sedimentary rocks and metamorphic rocks.1(iv)
Answer
When the molten magma cools down deep inside the earth’s crust then the solid rocks so formed are called intrusive rocks.
1(v)
Answer
When one type of rock changes to another type under certain conditions in a cyclic manner then this process of transformation of the rock from one to another is known as the rock cycle.1(vi)
Answer
(i) Hard rocks are used in construction of buildings and roads.
(ii) Some rocks are shiny and precious therefore used for making jewellery.
(iii) Rocks are made up of different minerals and are very important to humankind.
(iv) Some are used as fuels. For example, coal, natural gas and petroleum.
(v) Soft rocks are used for making talcum powder, chalks etc.
1(vii)
Answer
2(i)
(a) Igneous
(b) Sedimentary
(c) Metamorphic
Answer
2(ii)
(a) Crust
(b) Core
(c) Mantle
Answer
✓ (b) Core2(iii)
(a) Rocks
(b) Minerals
(c) Fossils
Answer
2(iv)
(a) Sedimentary rocks
(b) Metamorphic rocks
(c) Igneous rocks
Answer
2(v)
(a) Crust
(b) Mantle
(c) Core
Answer
✓ (a) Crust3
Match the following.
(i) Core | (a) Earth’s surface |
(ii) Minerals | (b) Used for roads and buildings |
(iii) Rocks | (c) Made of silicon and alumina |
(iv) Clay | (d) Has definite chemical composition |
(v) Sial | (e) Innermost layer |
- | (f) Changes into slate |
- | (g) Process of transformation of the rock |
Answer
(i) Core | (e) Innermost layer |
(ii) Minerals | (d) Has definite chemical composition |
(iii) Rocks | (b) Used for roads and buildings |
(iv) Clay | (f) Changes into slate |
(v) Sial | (c) Made of silicon and alumina |
4(i)
Answer
4(ii)
Answer
4(iii)
Answer
Limestone is changed into marble because of extreme heat and pressure as it is a sedimentary rock.