Podcast
Questions and Answers
What percentage of Earth's surface water is salt water found in oceans?
What percentage of Earth's surface water is salt water found in oceans?
- About 97% (correct)
- About 3%
- About 75%
- About 50%
Why can't we drink salt water or use it to grow crops?
Why can't we drink salt water or use it to grow crops?
- It is not suitable for consumption (correct)
- It is too cold
- It contains harmful chemicals
- It lacks essential nutrients
What percentage of Earth's water is fresh water?
What percentage of Earth's water is fresh water?
- About 75%
- About 50%
- About 97%
- About 3% (correct)
Where is most of the fresh water frozen?
Where is most of the fresh water frozen?
What is a glacier?
What is a glacier?
Which continent has a giant ice cap covering it?
Which continent has a giant ice cap covering it?
What percentage of Earth's fresh water is accounted for by the frozen water?
What percentage of Earth's fresh water is accounted for by the frozen water?
Where is groundwater stored?
Where is groundwater stored?
What percentage of Earth's fresh water is groundwater?
What percentage of Earth's fresh water is groundwater?
How is fresh water obtained from aquifers?
How is fresh water obtained from aquifers?
What are examples of running water sources?
What are examples of running water sources?
What is the purpose of a reservoir?
What is the purpose of a reservoir?
How are reservoirs usually created?
How are reservoirs usually created?
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Study Notes
Water Distribution on Earth
- About 97% of Earth's surface water is salt water found in oceans.
- Salt water cannot be used for drinking or growing crops because of its high salt concentration.
Fresh Water
- Only about 3% of Earth's water is fresh water.
- About 68% of the fresh water is frozen, mainly in glaciers and ice caps.
Glaciers and Ice Caps
- A glacier is a large, slowly moving river of ice and snow formed by compacted snow.
- The continent of Antarctica has a giant ice cap covering it.
Groundwater
- Groundwater is stored in aquifers, which are layers of rock that are porous and permeable.
- About 29% of Earth's fresh water is groundwater.
Obtaining Fresh Water
- Fresh water can be obtained from aquifers through drilling or digging wells.
- Examples of running water sources include rivers, streams, and lakes.
- Reservoirs are artificial lakes used to store water, usually created by building dams across rivers.
- The purpose of a reservoir is to collect and store water for various uses.
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