On the Earth more than 97 % of the water is salt water. Three quaters (2,25%) of the remaining 3% of fresh water is frozen at the North and South Poles.
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15
Why is demand for energy increasing everywhere in the world?
As the population of the world increases and the standard of living goes up in other countries, so will the demand for energy.
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10
What is the population of Earth now? How many people can the Earth support?
Currently the population of Earth is about 7,88 billion people. The Earth may be able to support 9 billion people.
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20
Which are the world most populous countries? What tendency for population growth there?
FREE ANSWER
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15
What are commercial energy sources?
Commercial sources are coal, petroleum and electricity as they are bought and sold.
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15
What is the propotion of fresh and salt water on the Earth?
More than 97% of the water on Earth is salt water. Only 3% of the water on Earth is fresh water.
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15
What is the tendency of population growth in your country? (D)
Since the 1950s the Vietnamese population almost quadrupled. 70 years ago it was nearly 25 million and it will reach soon 100 million.
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15
What is desalinization? Why isn't a solution?
It's the removal of salt from salt water. It's not a solution to the shortage of fresh water because it takes a lot of energy and it's very expensive.s
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15
What threatens the clean air?
It is threatened by the growing population. The average person today puts about 1.1 metric tons of carbon into the atmosphere each year.
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10
Where do the air-pollutants come from?
Most of it comes from the burning fossil fuels - oil, gasoline, coal, wood and natural gas.
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10
What are the renewable natural resources?
Renewable natural sources can be replenished at a higher rate than they are consumed. These are: solar, wind, hydro, tidal, geothermical, biomass energy.
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15
What natural resources does the Earth have?
Raw materials found in the nature, such as crude oil, natural gas, stones, minerals, forest, land, animal, water resources.
