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Ice Cores

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-ESS3-5MS-ESS1-4
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 passage, aligned with NGSS standards MS-ESS3-5 and MS-ESS1-4, explores the scientific process of extracting and analyzing ice cores from Greenland and Antarctica to study Earth’s ancient atmospheres. Students will learn how snow layers trap air bubbles, preserving samples of the atmosphere from thousands of years ago. The passage explains how scientists measure temperature changes using isotopes and track carbon dioxide concentration to understand climate patterns over time. Key findings highlight that current CO₂ levels are unprecedented in both concentration and speed of increase. The content integrates vocabulary, multiple examples, and cause-and-effect relationships, supporting deep understanding of climate systems and human impact. Activities include quizzes, writing prompts, and graphic organizers to reinforce comprehension. Audio integration is available for diverse learners. This resource is designed for middle school science students and is ideal for lessons on Earth’s systems, climate change, and scientific evidence.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

Ice cores are cylindrical samples that scientists drill from deep within glaciers and ice sheets. These cores function like frozen time capsules. Each layer of ice represents a single year of snowfall that compressed over time. Scientists can extract cores reaching depths of several miles, capturing climate information from hundreds of thousands of years ago.

The most valuable feature of ice cores is the tiny air bubbles trapped inside. When snow falls and compresses into ice, small pockets of air become sealed within. These bubbles contain actual samples of Earth's ancient atmosphere. Scientists carefully extract the air and analyze its chemical composition. They measure the amounts of different gases, especially carbon dioxide. They also examine the ice itself to determine past temperatures. Evidence shows that ice contains different forms of oxygen atoms called isotopes. The ratio of these isotopes changes with temperature, allowing researchers to reconstruct climate conditions.

Data from ice cores reveal a striking pattern. Temperature and carbon dioxide levels have risen and fallen together throughout Earth's history. When CO2 was high, temperatures were warm. When CO2 dropped, temperatures cooled. This relationship appears consistent across hundreds of thousands of years. Scientists have drilled ice cores in Antarctica that extend back 800,000 years. The Vostok ice core, extracted from East Antarctica, provides one of the longest continuous climate records available. Analysis of this core shows natural fluctuations in CO2 levels ranging between about 180 and 280 parts per million.

Today's atmospheric CO2 concentration exceeds 420 parts per million. This level is far higher than anything recorded in ice cores from the past 800,000 years. The increase occurred rapidly over just the past 150 years. Scientists explain that this change corresponds with increased burning of fossil fuels by humans. The ice core evidence matters because it demonstrates that current conditions are unusual compared to Earth's recent geological history. This data helps scientists understand how Earth's climate system responds to changes in greenhouse gases.

Interesting Fact: The deepest ice core ever drilled reached a depth of 12,000 feet in Antarctica. At the bottom, the ice was nearly 800,000 years old.

What do ice cores contain that provides samples of Earth's ancient atmosphere?

Frozen water dropletsTiny air bubblesAncient plant materialRock fragments

How do scientists determine past temperatures from ice cores?

By measuring the thickness of ice layersBy counting air bubbles in the iceBy examining the ratio of oxygen isotopesBy testing the color of the ice

What pattern have scientists discovered about temperature and CO2 levels in ice core data?

They move in opposite directionsThey rise and fall togetherTemperature changes but CO2 stays constantThey have no relationship

In the context of the passage, what does the word 'compressed' mean?

Melted and refrozenPressed together tightlySpread out over a large areaMixed with other materials

What does 'fluctuations' mean as used in the passage?

Steady increases over timeComplete disappearanceChanges that go up and downPermanent stability

Based on the passage, why is the Vostok ice core important?

It was the first ice core ever drilledIt provides one of the longest continuous climate recordsIt contains the most air bubblesIt was drilled in the North Pole

What can you infer about the relationship between human activity and current CO2 levels?

Human activity has no effect on CO2 levelsBurning fossil fuels has likely contributed to unusually high CO2 levelsHumans have decreased CO2 levels over timeNatural processes alone explain current CO2 levels

If scientists discovered an ice core with CO2 levels of 250 parts per million, what could they predict about the temperature during that time period?

It would be extremely hotIt would be within the natural range shown in the ice core recordIt would be colder than any time in Earth's historyTemperature cannot be predicted from CO2 levels

True or False: Each layer in an ice core represents approximately one year of snowfall.

TrueFalse

True or False: Current atmospheric CO2 levels are within the natural range found in ice cores from the past 800,000 years.

TrueFalse