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Questions and Answers
What percentage of the earth's water is fresh water?
What percentage of the earth's water is fresh water?
- 25%
- 3% (correct)
- 50%
- 10%
Where is the majority of fresh water stored on earth?
Where is the majority of fresh water stored on earth?
- Seas and oceans
- Rivers and lakes
- Polar ice-caps and glaciers (correct)
- Underground reservoirs
What is the main cause of contamination of drinking water mentioned in the text?
What is the main cause of contamination of drinking water mentioned in the text?
- Industrial waste
- Biological sources such as human and animal fecal wastes (correct)
- Agricultural pesticides
- Radioactive substances
Which water source is too salty for drinking, agriculture, and industrial purposes?
Which water source is too salty for drinking, agriculture, and industrial purposes?
Where does the fresh water used by humans come from?
Where does the fresh water used by humans come from?
What percentage of the earth's water is salt water of the seas?
What percentage of the earth's water is salt water of the seas?
Where is the majority of fresh water stored on earth?
Where is the majority of fresh water stored on earth?
What is the main cause of contamination of drinking water mentioned in the text?
What is the main cause of contamination of drinking water mentioned in the text?
What percentage of fresh water is found as underground water?
What percentage of fresh water is found as underground water?
Which source provides the fresh water used by humans?
Which source provides the fresh water used by humans?
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Study Notes
Fresh Water Facts
- Approximately 2.5% of Earth's water is fresh water.
- The majority of fresh water is stored in glaciers and ice caps, constituting about 68.7% of the total fresh water.
- Groundwater accounts for roughly 30.1% of fresh water, while surface water sources, like lakes and rivers, comprise a small percentage.
Water Contamination
- Major causes of drinking water contamination include industrial waste, agricultural runoff, and sewage discharge.
- Contaminated drinking water can lead to serious health issues for communities.
Salt Water vs. Fresh Water
- About 97.5% of Earth's water is salty, primarily found in oceans, making it unsuitable for drinking or irrigation.
- Saline water is too salty for human consumption, agriculture, and many industrial processes.
Human Use of Fresh Water
- The fresh water used by humans predominantly comes from surface water sources like rivers and lakes as well as extracted groundwater.
Distribution of Fresh Water
- A significant portion of fresh water is trapped underground, highlighting the importance of aquifers for drinking sources and irrigation.
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