Class 7 Earth Internal Composition and Landform

Last updated on October 16th, 2022 at 01:31 pm

Class 7 Earth Internal Composition and Landform

Class 7 Earth Internal Composition and Landform | GSEB Class 7 Social Science Solutions | for Gujarat board students to prepare for exams.

Match the following

The uppermost layer of the earth SiAL
Metamorphic rocks Marble
Work of river  Floodplain
Work of wind   Sand dunes
Eroded form of the glacier Moraine

 

Fill in the blanks:

  • The innermost layer of the earth is known as …………………[core]
  • …………. stone is used to grind grains. [granite]
  • The place where the vibration starts below the surface is called………. center. [epicenter]
  • The wall-like topography formed due to erosion of the ocean waves is known as …………. [stack]
  • As the speed of the wind decreases and soil particles spread on the ground, it is known as …………. []

 

Answer the following questions in one sentence:

 

  • Which minerals are mainly composed in the sial layer?
  • Silica and alumina are the main minerals found in the sial layer.

 

Name the 3 main types of rocks.

The main 3 types of rocks are:

  • Igneous rocks
  • Sedimentary rocks
  • Metamorphic rocks

 

  • What are intrusive igneous rocks?
  • When molten magma cools down deep inside the earth’s crust, solid rocks are formed which are called intrusive igneous rocks.

 

  • What is endogenic force?
  • The movement which is generated in the interior of the earth is called endogenic forces.

 

  • What is a waterfall?
  • Waterfalls are formed when rivers tumble over rocks or down valleys at a steep angle.

 

Updated: October 16, 2022 — 1:31 pm

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