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How Is Water Distributed on Earth

Interactive passage with audio narration, comprehension questions, and printable PDF.

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Format: Interactive (Online), Printable (PDF)
Grades: 5678
Subjects: scienceela
Standards: MS-ESS2-4
Languages: English, Spanish

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What's included

Reading passage

Reading comprehension

Audio narration

With word word highlighting

Comprehension quiz

Auto-graded

Writing activity

Open-ended response

Glossary & flashcards

Vocabulary practice

Differentiated version

Adapted for varied levels

Spanish translation

Bilingual support

About this reader

This comprehensive middle school science reading passage examines how water is distributed on Earth, aligned with NGSS standard MS-ESS2-4 and disciplinary core idea MS-ESS2.C. Students explore why only a tiny fraction of Earth's 326 million cubic miles of water is accessible for human use. The passage explains that 97% of water is salty ocean water, while only 3% is freshwater. Most freshwater remains locked in glaciers and ice caps or stored as groundwater. Less than 0.5% exists as liquid freshwater in lakes, rivers, and soil moisture that eight billion people depend on daily. This audio-integrated resource includes differentiated versions for struggling readers, Spanish translations, vocabulary glossaries, multiple-choice questions, writing activities, and graphic organizers. Students develop understanding of Earth's hydrosphere and the importance of water conservation through evidence-based explanations and real-world connections to water scarcity challenges.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

Earth holds approximately 326 million cubic miles of water. This water exists in oceans, ice, underground reservoirs, and freshwater sources. However, most of Earth's water is not available for human use. Understanding how water is distributed helps scientists explain why water scarcity affects many regions.

The vast majority of Earth's water is saltwater found in oceans. Evidence shows that 97% of all water on Earth contains dissolved salts. This ocean water cannot be used for drinking or agriculture without expensive treatment. Only 3% of Earth's water is freshwater, which contains very low amounts of dissolved salts. This small percentage must support all land-based life.

Most freshwater is not easily accessible to humans. Scientists observe that about 69% of Earth's freshwater is frozen in glaciers and ice caps near the poles. Another 30% exists as groundwater stored in spaces between rocks and soil deep underground. Some groundwater can be reached through wells. However, much of it lies too deep for practical use. Less than 1% of freshwater exists in lakes, rivers, and soil moisture.

When scientists calculate the total amount of accessible water, the numbers are striking. Less than 0.5% of all Earth's water exists as liquid freshwater that humans can easily use. This tiny fraction is found in rivers, lakes, and shallow groundwater. Eight billion people depend on this limited supply for drinking, cooking, farming, and industry. The water cycle continuously moves water between the ocean, atmosphere, and land through evaporation, condensation, and precipitation. This process can renew freshwater supplies over time.

Cape Town, South Africa, experienced severe water shortages in 2018. The city's reservoirs dropped to dangerous levels after three years of low rainfall. Residents were limited to 50 liters of water per person each day. This event demonstrated how communities can face water scarcity when freshwater supplies decrease. Climate patterns and human water use both affect the availability of accessible freshwater.

Understanding water distribution matters for managing Earth's limited freshwater resources. Population growth increases demand for water while supplies remain relatively constant. The hydrosphere, which includes all water on Earth, connects to other Earth systems. Changes in one part of the water system can affect water availability elsewhere. Conservation efforts and careful water management help ensure that freshwater remains available for future generations.

Interesting Fact: If all of Earth's water could fit in a gallon jug, the freshwater available for human use would equal just over half a teaspoon!

What percentage of Earth's water is saltwater found in oceans?

3%69%97%0.5%

Where is most of Earth's freshwater stored?

In rivers and lakesIn glaciers and ice capsIn the atmosphereIn underground wells

What does the term 'groundwater' mean in the passage?

Water found on the surface of the groundWater stored in spaces between rocks and soil undergroundWater that falls as rainWater frozen in glaciers

What does 'evaporation' refer to in the water cycle?

Water freezing into iceRain falling from cloudsLiquid water changing into water vaporWater flowing into rivers

Why is ocean water not suitable for drinking or agriculture?

It is too coldIt contains too much dissolved saltIt is too deep undergroundIt is frozen in ice caps

What can be inferred about water availability from the Cape Town example?

All cities have unlimited water suppliesRainfall patterns and human use affect freshwater availabilityOcean water can easily replace freshwaterGroundwater never runs out

How does the water cycle help maintain freshwater supplies?

It creates new water moleculesIt removes salt from ocean water permanentlyIt continuously moves and renews water through evaporation and precipitationIt stores all water underground

If a community wanted to access more freshwater during a drought, which source would be most practical?

Melting polar ice capsDrilling wells to reach shallow groundwaterUsing ocean water directlyCollecting water from glaciers

True or False: Less than 1% of Earth's freshwater exists in rivers, lakes, and soil moisture.

TrueFalse

True or False: The hydrosphere operates independently and does not connect to other Earth systems.

TrueFalse