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Global Water Distribution Mapping

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Global Water Distribution Mapping

Use the information and visual on this sheet to investigate where Earth’s water is found and why access to freshwater varies. Answer in your own words where appropriate. Water amounts are approximate global estimates.

A small share, unevenly stored

About 97.5% of Earth’s water is saltwater, mostly in oceans. Only about 2.5% is freshwater. Of that freshwater, roughly 69% is locked in glaciers and ice caps, about 30% is groundwater, and less than 1% is in rivers, lakes, wetlands and the atmosphere. These percentages are rounded estimates. Freshwater is not spread evenly across the world, and not all freshwater is easy for people to access.

Region

Water clue

Possible reason

Amazon Basin, South America

Large river system and abundant rainfall

Warm, humid climate; extensive river network

Great Lakes region, North America

Very large group of freshwater lakes

Many connected lakes and rivers

Sahara, North Africa

Very limited surface water

Low rainfall and high evaporation

Parts of the Middle East

Water scarcity is a major challenge

Low rainfall in many areas; demand can be high

Investigate the pattern

Answer using the freshwater facts and regional clues above. A water-rich region may still face pollution, unequal access or seasonal shortages.

1.Which statement best describes the proportion of Earth’s water that is freshwater?
  • About one-half
  • About one-quarter
  • About one-fortieth
  • About three-quarters
2.Where is the greatest share of Earth’s freshwater stored?
  • Rivers and lakes
  • Glaciers and ice caps
  • The atmosphere
  • Wetlands
3.Put these freshwater stores in order from largest share to smallest share: rivers, lakes and atmosphere; groundwater; glaciers and ice caps.
4.Match each region to its best description: Amazon Basin; Great Lakes region; Sahara; parts of the Middle East. Descriptions: A. Large freshwater lakes; B. Low rainfall and limited surface water; C. River system and abundant rainfall; D. Water scarcity is a major challenge.
  • Amazon Basin
  • Great Lakes region
  • Sahara
  • Parts of the Middle East
  • A. Large freshwater lakes
  • D. Water scarcity is a major challenge
  • C. River system and abundant rainfall
  • B. Low rainfall and limited surface water
5.A student says, “There is lots of water on Earth, so every community can easily get safe freshwater.” Is this claim accurate? Give one reason for your answer.
6.Choose two factors that can help explain why water availability differs between regions.
  • Rainfall and evaporation patterns
  • The colour of a country’s flag
  • The presence of rivers, lakes or glaciers
  • The number of languages spoken
7.Compare the Amazon Basin and the Sahara using the regional clues. State one difference in their water availability and explain a likely cause.
8.Name one way water scarcity could affect people’s lives or livelihoods in a region with low rainfall.
9.A town uses groundwater faster than rain can replenish it. What is one likely long-term consequence?
10.Why can a region with abundant natural freshwater still have communities without reliable safe water? Give one possible reason.
11.Write a two-sentence conclusion explaining why global freshwater distribution matters for people and the environment.

3 printable pages

  • Global Water Distribution Mapping, page 1 of 3: A small share, unevenly stored, Investigate the pattern

    Page 1

  • Global Water Distribution Mapping, page 2 of 3: 2. Where is the greatest share of Earth’s freshwater stored?

    Page 2

  • Global Water Distribution Mapping, page 3 of 3: 7. Compare the Amazon Basin and the Sahara using the regional clues. State one difference…

    Page 3

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