A. Tick the correct answer:-

1. A 2. D 3. D 4. D 

B. Differentiate between the following:-

1. Earth profile is cross section of ground. Different zone of profile are A,B,C horizonand bedrock.

         Earth horizontal is upper surface of the earth Earth.

2. Loamy soil is better than clearly soil for plant growth.

3. Earth erosion is erosion of soil by flowing water, air etc.

      Earth pollution is pollution from industrial refuse and harmful chemical from industry.

C. Give one word answer for each of the following:-

1. Weathering 2. Humus 3. Regolith 4. Red soil 

D. Match column A with column B:-

1. Fertile 2. Porus 3. Holds large amount of water 4. Rich in organic matter 

E. Give two examples for each of the following:-

1. Loamy, Clayey 2. Chemical,Biological 3. A,B 4. Garbage,Chemicals 

F. Give reasons for each of the following:-

1. On Earth large tree grows. Trees supply Oxygen and food for humanity.

        In earth lot of minerals are found which give different metals.

2. (a) Due to extreme hot (b) Due to acid rain (c) Due to biological life.

3. All types of soil do not contain necessary nutrient for plant growth. Some even do not contain air and water gap.

4. It its long time to form earth by weathering. Also difficult to replenish.

G. Write true or false:-

1. True 2. True 3. False 4. True 5. True 

H. Circle the odd one out:-

1. Laterite 2. pH 3. Loamy 4. Reforestation 5. Sewage

I. Fill in the blanks:-

1. Solum 2. Sunlight 3. Rock 4. Many 5. Dam

J. Short answer questions:-

1. Earth is something which is formed by weathering of rocks.

        Different layers are A,B,C and bedrock.

2. Composition of earth-

(a) Earth particles.

(b) Humus.

(c) Earth water.

(d) Earth air.

(e) Earth organism.

3. Sandy soil is least fertile among three. Clayey soil is somewhat fertile. Loamy soil is the most fertile.

4. Many types of earth are found in India. example laterite,loamy etc.

5. Earth erosion is loss of earth because of wind/air,running water.

      Two methods of erosion-

(a) Plantation of tree.

(b) Laying huge granite rock along river bank.

K. Long answer questions:-

1. Earth is formed due to erosion of rock. Different process of erosion are-

(a) Physical weathering- In this process rocks disintegrated due to heat expansion and contraction of rocks and change of temperature. 

(b) Chemical weathering- Here disingration of rocks takes place due to acid rain. Here acid react with carbonate content of rocks.

(c) Biological weathering-Rock form crack due to physical weathering. Here plant like lichen, herb etc.grow whose roads break rock to form Earth. Microorganisms also   elong crack present in rock.

2. Properties of Earth-

(a) Colour- Iron content soil is red, chromium content soil is yellow. Manganese  soil is black brown soil is a mixture of iron soil and organic matter.

(b) Moisture in soil- Air and water enhance quality of soil. This increase growth of plant.

(c) Absorption of water- This this is presence of different size particles like clay, silt, gravel sand. Also depend on air space.

3. Earth as a natural resource-

(a) Earth contains valuable mineral.

(b) contents very require fossil.

(c) contain clay makes building material brick,image.

(d) Hold water in aquifers.

4. Causes of soil erosion-

(a) Deforestation 

(b) Forest fire 

(c) Over grazing 

(d) Step farming 

(e) Heavy rainfall 

(f) Droughts 

        Steps to prevent-

(a) Afforestation

(b) Stop over grazing

(c) Growing plants

(d) Causes of soil.

5. Causes of soil pollution-

(a) pesticides that spray on agriculture field.

(b) industrial effluent.

(c) sewage from factories.

(d) garbage and plastic from residence.

Methods for reduce-

(a) Require as per lab research.

(b) Filter off effluent.e.g. Carbon filter in case of refractory .Kiln in steel industry.

(c) Filter of sewage.

(d) Modern method of garbage treatment for dry, wet, semidry refuse.