Class 5 My Science, Health and Physical Education Guide Part 1 - Science Lesson 13

Class 5 My Science, Health and Physical Education Guide

Part 1 - Science

Lesson 13 - The Earth

1. Put a tick (√) if the statement is correct and a cross (×) if it is wrong.

Answer 👉

a. The weathering of the earth’s surface due to various causes is called soil erosion. (×)

b. Mantle is the thickest layer of the earth. (√)

c. The plain area surrounded by hills is called valley. (×)

d. The rivers cause the weathering of rocks and carry them away to make a pile in plain area. (×)

e. Farming without terrace in slopes causes soil erosion in greater quantity. (√)

2. Fill in the blank spaces with the correct words.

Answer 👉

a. The monsoon rain makes the soil of the land fertile.

b. The causes of the change in the earth’s surface are: wind, water, animals and human activities.

c. The monsoon water carries away the surface soil of slopes more easily than that of plain area.

d. The rise and fall of the temperature causes expansion and contraction of rocks.

3. Answer the following questions.

a. How does the earth’s surface get changed during rainfall?

Answer 👉 During rainfall, the water can cause erosion by washing away soil and other materials from the surface of the earth. This erosion can lead to the formation of valleys and can also change the shape of riverbanks and coastlines.

b. Write the names of minerals found in the inner core of the earth.

Answer 👉 The inner core of the earth is believed to be composed primarily of iron and nickel.

c. What are the main causes of the change in the earth’s surface?

Answer 👉 The main causes of the change in the earth's surface are wind, water, animals, and geological activity such as earthquakes and volcanoes.

d. What is soil erosion and deposition?

Answer 👉 Soil erosion is the process of the removal and transport of soil by natural agents, primarily water and wind. Deposition is the process by which eroded soil is redeposited in a new location.

e. How does the heat of the sun cause change in the earth’s surface? Explain.

Answer 👉 The heat of the sun causes changes in the earth's surface through a process called weathering. The heat can cause rocks to expand during the day and contract at night, leading to the formation of cracks. These cracks can allow water to enter, which can freeze and expand, causing the rock to break apart. The sun can also cause materials like soil and rocks to dry out, leading to their decomposition and erosion.

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