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How Climate Change Affects Oceans

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

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Format: Interactive (Online), Printable (PDF)
Grades: 5678
Subjects: sciencereadingela
Standards: MS-ESS3-5
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 NGSS-aligned passage explores major changes occurring in Earth’s oceans, focusing on the mechanisms and impacts of ocean warming and acidification. Students will learn how the ocean absorbs excess heat and carbon dioxide from the atmosphere, leading to rising temperatures, lower pH levels, and significant consequences for marine life and global systems. The passage explains scientific evidence, processes like coral bleaching and the formation of carbonic acid, and the broader implications for food webs and climate. Activities include comprehension questions, writing prompts, and graphic organizers to deepen understanding. Designed for grades 6-8, this resource integrates academic vocabulary, systems thinking, and real-world connections. Audio integration supports diverse learners, and the included Spanish translations foster accessibility for bilingual students. This comprehensive package supports the development of scientific literacy and critical thinking, making it ideal for middle school science classrooms.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

Oceans cover most of Earth's surface and play a critical role in regulating climate. Evidence shows that the oceans have absorbed over ninety percent of the extra heat trapped by greenhouse gases since the 1970s. They have also absorbed about one-third of the carbon dioxide humans have released into the atmosphere. This absorption acts as a powerful buffer that has slowed warming on land. However, this protection comes at a significant cost to the ocean itself.

When oceans absorb heat, the water warms and expands in a process called thermal expansion. Scientists explain that warmer water takes up more space than cooler water. This expansion is one major cause of sea level rise. At the same time, when oceans absorb carbon dioxide, a chemical reaction occurs that makes seawater more acidic. This process is called ocean acidification. More acidic water can harm marine organisms, especially those with shells or skeletons made of calcium carbonate, such as corals and shellfish.

Ocean warming also disrupts ocean currents, which are like rivers flowing through the sea. These currents distribute heat around the planet and influence weather patterns. Scientists observe that changes in water temperature can alter the strength and direction of these currents. Warmer waters also hold less dissolved oxygen, which marine life needs to survive. Evidence from coral reefs shows that warming temperatures cause coral bleaching events. During bleaching, corals expel the algae living in their tissues and lose their color and primary food source.

The Great Barrier Reef in Australia provides a real-world example of these impacts. Scientists have documented multiple mass bleaching events since 2016, with rising ocean temperatures identified as the primary cause. These events have damaged large sections of the reef ecosystem. The changes affect not only corals but also the thousands of species that depend on reef habitats for food and shelter.

Understanding how climate change affects oceans matters because ocean health connects to human well-being. Oceans provide food for billions of people, regulate Earth's climate, and produce much of the oxygen we breathe. Changes in ocean temperature, chemistry, and currents can affect weather patterns, fisheries, and coastal communities worldwide. The ocean has protected us from more severe warming on land, but the changes occurring beneath the waves have consequences that extend far beyond the water's edge.

Interesting Fact: The ocean has absorbed so much heat from climate change that if all that energy had stayed in the atmosphere instead, Earth's air temperature would have increased by an additional 36 degrees Celsius (about 65 degrees Fahrenheit).

What percentage of extra heat trapped by greenhouse gases have the oceans absorbed?

About fifty percentOver ninety percentAbout one-thirdLess than twenty percent

What is thermal expansion?

The process of ice melting in the oceanThe movement of ocean currentsThe process by which warmer water takes up more space than cooler waterThe release of gases from the ocean

According to the passage, what happens when oceans absorb carbon dioxide?

The water becomes colderThe water becomes more acidicOcean currents speed upSea levels decrease

Which organisms are especially harmed by ocean acidification?

Fish that swim in deep waterOrganisms with shells or skeletons made of calcium carbonateLarge marine mammalsSeaweed and kelp

What real-world example does the passage use to show ocean warming impacts?

The Arctic ice capsThe Pacific Ocean currentsThe Great Barrier Reef in AustraliaThe Atlantic salmon population

How do ocean currents function according to the passage?

They only affect coastal areasThey distribute heat around the planet and influence weather patternsThey prevent ocean acidificationThey stop thermal expansion

Based on the passage, what can you infer about the relationship between ocean health and human well-being?

They are completely unrelatedOcean health only affects people who live near the coastOcean health is closely connected to human well-being through food, climate, and oxygenHuman well-being depends only on the ocean's temperature

If ocean temperatures continue to rise, what would likely happen to coral reefs based on the passage?

They would grow larger and healthierThey would experience more bleaching events and damageThey would move to deeper waterThey would become less colorful but remain healthy

True or False: Warmer ocean water holds more dissolved oxygen than cooler water.

TrueFalse

True or False: The ocean acts as a buffer that has slowed warming on land by absorbing heat and carbon dioxide.

TrueFalse