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Questions and Answers
What percentage of Earth's surface is covered with water?
What percentage of Earth's surface is covered with water?
Which of the following shows the largest percentage of Earth's water resources?
Which of the following shows the largest percentage of Earth's water resources?
What is the primary purpose of the hydrologic cycle?
What is the primary purpose of the hydrologic cycle?
Which spheres of Earth are involved in the movement of water according to the hydrologic cycle?
Which spheres of Earth are involved in the movement of water according to the hydrologic cycle?
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What percentage of Earth's water is freshwater that humans can easily use?
What percentage of Earth's water is freshwater that humans can easily use?
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What percentage of Earth's freshwater is found in the atmosphere?
What percentage of Earth's freshwater is found in the atmosphere?
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Which statement is true regarding the movement of water from the atmosphere to the ground?
Which statement is true regarding the movement of water from the atmosphere to the ground?
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What is the estimated percentage of Earth's surface that consists of freshwater?
What is the estimated percentage of Earth's surface that consists of freshwater?
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Which body of water is the largest source of fresh surface water on Earth?
Which body of water is the largest source of fresh surface water on Earth?
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What percentage of Earth's freshwater is contained in major drainage or river basins?
What percentage of Earth's freshwater is contained in major drainage or river basins?
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How much of Earth's freshwater is classified as non-renewable?
How much of Earth's freshwater is classified as non-renewable?
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What is the main method of freshwater returning to the atmosphere?
What is the main method of freshwater returning to the atmosphere?
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Which of the following factors influences the proportion of precipitation that returns to the atmosphere?
Which of the following factors influences the proportion of precipitation that returns to the atmosphere?
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Which process is NOT involved in the hydrologic cycle?
Which process is NOT involved in the hydrologic cycle?
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What percentage of Earth's freshwater is found in ice caps, glaciers, and permanent snow?
What percentage of Earth's freshwater is found in ice caps, glaciers, and permanent snow?
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Which source contains the smallest volume of water?
Which source contains the smallest volume of water?
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What is the volume of groundwater in cubic kilometers?
What is the volume of groundwater in cubic kilometers?
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Which of the following is the largest source of Earth's water?
Which of the following is the largest source of Earth's water?
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What is the primary type of water found in lakes?
What is the primary type of water found in lakes?
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What percent of total water is found in the atmosphere?
What percent of total water is found in the atmosphere?
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Which of the following water sources has the least volume relative to others listed?
Which of the following water sources has the least volume relative to others listed?
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Study Notes
Earth's Water Resources
- Water covers 71% of Earth's surface
- Only 2.5% of Earth's water is freshwater
- Only 0.4% of freshwater is readily usable by humans
Earth's Freshwater Distribution
- 75% of Earth's freshwater is frozen
- 96% of Earth's freshwater is underground
- 0.25% of Earth's freshwater is on the surface
- Lakes are the largest source of surface freshwater
Water Cycle Processes
- Evaporation: Water turning into vapor
- Precipitation: Water falling from the atmosphere as rain, snow, sleet, or hail
- Infiltration: Water soaking into the ground
- Runoff: Water flowing over the surface
- Transpiration: Water vapor released by plants
- Evapotranspiration: Combined process of evaporation and transpiration
Hydrologic Cycle
- Water constantly moves between different spheres: atmosphere, hydrosphere, geosphere, and biosphere
- Water constantly moves between reservoirs and through pathways
Major Water Reservoirs and Pathways
- Reservoirs: Oceans, glaciers, groundwater, lakes, rivers
- Pathways: Evaporation, transpiration, precipitation, runoff, infiltration, sublimation
Aquifers
- Aquifers: underground layers of rock that store water
- Water stored in aquifers in between intergranular spaces
Water Usage
- 2.2 billion people lack safely managed drinking water
- 3.5 billion people lack safely managed sanitation
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Description
Explore the fascinating world of Earth's water resources and the hydrologic cycle. This quiz covers freshwater distribution, major water reservoirs, and the processes involved in the water cycle, including evaporation and transpiration. Test your knowledge about how water moves through our planet's spheres.
