1. What percentage of the earth's surface is made up of land masses?
rom
ontal
powd Answer the following questions orally.
lants 2. What is soil?
3. What is humus?
4. List three factors that affect soil formation.
5. Mention two things that may trigger mudflows.
also 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.
Answer the following questions in not more than on
form
d be
Answers
Answer 1
About 29% of Earth's surface is land consisting of continents and Islands. The remaining 71% is covered with water , mostly by oceans but also lakes, rivers and other freshwater ,which all together constitutes the Hydrosphere.
Answer 2
Soil is a mixture of organic matter, minerals, gases ,liquids and organisms that together support life.
Answer 3
Humus is the Organic component of soil, formed by the decomposition of leaves and other plants materials by soil Microorganisms.
Answer 4
Parent Material , Climate ,Biota (organisms) , topography and time are the factors that affect soil formation.
Answer 5
Heavy rainfall, snow melts or high level of groundwater flowing through cracked Bedrock main Trigger of moment of soil or sediments.
Answer 6
There are many ways in which soil can polluted are :-
Seepage from a landfill.
Discharge of the industrial waste into the soil.
Solid waste seepage.
Answer 7
Broadly there are two ways of harvesting rainwater are:- surface runoff harvesting and rooftop rainwater harvesting.
Answer 8
Typhoid fever, Cholera, polio are the diseases spread through contaminated of drinking water .
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