A. Answer the following questions in one word.
1. What percentage of the earth's surface is made up of land masses?
2. What is soil?
3. What is humus?
4. List three factors that affect soil formation.
5. Mention two things that may trigger mudflows.
6. What are the two ways in which soil gets polluted.
7. Mention two ways of harvesting rainwater.
8. Name two diseases that spread through contaminated drinking water.
Answers
1)29%
2)Soil can be defined as the organic and inorganic materials on the surface of the earth that provide the medium for plant growth
3)the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms.
4)Climate, Relief and Organisms.
5)heavy rainfall and rapid snow fall
6)(i)By burying plastics in soil.
(ii)By over use of fertilizers .
7(i).You can harvest rain water on roof.
(ii)Well
8)Cholera and Typhoid
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1) 29 %
2)The upper layer of earth crust is known as soil. It is the mixture of organic remains, clay and rock particles. Soil is mainly formed due to the weathering.
3)Humus can be simply defined as the fertile and the important constituent of the soil.Humus are the dark, organic material present on top of the soil. This organic matter mainly constitutes of dead and decaying animal substances, dried leaves, twigs, grasses, vegetables, microbes and other nutrients.
4) Factors that affect soil formation. Soils form from the interplay of five main factors namely Parent material, Time, Climate, Relief and Organisms. Parent material: This refers to the mineral material or organic material from which the soil is formed.
5)mudflow are triggered by heavy rains and rapid snowmelts
6)Soil gets polluted because of the various factors like:
i). Discharge of toxic Industrial waste into rivers and lakes
ii). Excessive use of fertilizers and pesticides in agriculture
iii). Contamination of water-bodies with toxic metals such as leads arsenic , cadmium, mercury, nickel etc.
7)the two ways of harvesting rainwater are.....you can harvest rain water on roof or by surface runoff...and there is one more way where rain water goes under the ground..so when you dig you find water !
8)Dysentery. Dysentery is a combination of nausea, abdominal cramps coupled with severe diarrhoea
Cholera.