Question : Sea water is saltier than rain water because
Option 1: rivers wash away salts from earth and pour them into the sea
Option 2: sea beds have salt producing mines
Option 3: sea animals are salt producing
Option 4: the air around the sea is saltish
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Correct Answer: rivers wash away salts from earth and pour them into the sea
Solution : The correct answer is rivers wash away salts from earth and pour them into the sea.
Rivers wash away all the salts and sediments from mainland into the sea increasing the salinity of the sea compared to the rivers. The other reason is due to evaporation of water from oceans and seas, oceans remain more concentrated making it more saline. Sea water has a salinity more than 32 parts per thousand.
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Question : The following sentence has been divided into four parts. One of them contains an error. Select the part that contains the error from the given options.
The sun / revolves / around / a earth.
Option 1: The sun
Option 2: revolves
Option 3: a earth.
Option 4: around
Question : The main advantage of Rain Water Harvesting (RWH) is:
Option 1: Recharge ground water
Option 2: Avoid floods
Option 3: Reduce the loss of water
Option 4: Avoid soil erosion
Question : The sphere of living matter together with water, air and soil on the surface of the earth is known as ________.
Option 1: Lithosphere
Option 2: Biosphere
Option 3: Hydrosphere
Option 4: Atmosphere
Question : The sphere of living matter, together with water, air, and soil, on the surface of the Earth is known as _______.
Question : White clothes are cooler than black ones because they:
Option 1: absorb all the light that reaches them
Option 2: reflect all the light that reaches them
Option 3: will not allow the light to penetrate
Option 4: cool the sunlight completely
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