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Wetlands and Carbon Storage

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

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Format: Interactive (Online), Printable (PDF)
Grades: 5678
Subjects: scienceela
Languages: English, Spanish

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Reading passage

Reading comprehension

Audio narration

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Comprehension quiz

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Glossary & flashcards

Vocabulary practice

Differentiated version

Adapted for varied levels

Spanish translation

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About this reader

This 400-500 word informational science passage explores wetlands and carbon storage for middle school students in grades 6-8. Aligned with NGSS Earth Science standards, the passage explains how waterlogged soils in marshes, mangroves, peatlands, and seagrass meadows slow decomposition and trap carbon for centuries. Students discover that coastal wetlands store blue carbon more efficiently than many forests, packing away carbon per acre at remarkable rates. The passage examines the dangers of draining or destroying wetlands, which releases stored carbon rapidly, and emphasizes the importance of wetland protection and restoration. Audio-integrated features support diverse learners, while differentiated versions accommodate English Language Learners and struggling readers. Activities include comprehension questions, vocabulary development, writing prompts, and graphic organizers that encourage students to analyze cause-and-effect relationships in carbon cycling and compare different wetland types.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

Coastal wetlands like mangroves and salt marshes store what scientists call blue carbon. Mangrove forest in Loxahatchee, Florida by NOAA / Wikimedia Commons

Wetlands might seem like muddy, unimportant places, but they are powerful carbon heroes. These soggy ecosystems—including marshes, mangroves, peatlands, and seagrass meadows—store carbon remarkably well. Scientists explain that wetlands trap carbon because their waterlogged soils contain very little oxygen. Without oxygen, dead plants decay extremely slowly. This means carbon from plant material piles up over centuries instead of escaping into the atmosphere as carbon dioxide.

The process works because decomposition requires oxygen. When plants die in dry environments, tiny organisms called decomposers break them down quickly, releasing carbon dioxide. In wetlands, however, water fills the spaces between soil particles. This creates anaerobic conditions where decomposers cannot work efficiently. Dead plant material accumulates layer upon layer, forming thick deposits of carbon-rich soil. Over time, this stored carbon can remain locked away for hundreds or even thousands of years.

Coastal wetlands like mangroves and salt marshes store what scientists call blue carbon. Evidence shows these ecosystems pack away more carbon per acre than many forests. Mangrove forests, found in tropical and subtropical coastlines, have dense root systems that trap sediment and organic matter. Salt marshes along temperate coasts build up layers of carbon-rich mud. Seagrass meadows on shallow ocean floors also capture and store significant amounts of carbon. These coastal wetlands cover less than two percent of ocean area but may account for half of all carbon buried in ocean sediments.

The danger comes when humans drain or destroy wetlands for agriculture, development, or other purposes. Draining a wetland introduces oxygen into previously waterlogged soils. This reverses the carbon storage process rapidly. Decomposers become active again and break down centuries of accumulated plant material. The stored carbon escapes as carbon dioxide, contributing to climate change. A single drained peatland can release as much carbon in decades as it stored over thousands of years.

Protecting existing wetlands and rewetting drained ones keeps carbon locked underground. Scientists observe that wetland restoration projects can help reduce atmospheric carbon dioxide levels. When water returns to drained wetlands, anaerobic conditions form again and carbon storage resumes. Conservation efforts focus on preventing further wetland loss and restoring damaged ecosystems. Understanding wetlands as carbon storage systems shows why these ecosystems matter for Earth's climate stability.

Interesting Fact: Peatlands cover only three percent of Earth's land surface but store twice as much carbon as all the world's forests combined!

Why do wetlands store carbon so effectively?

Their waterlogged soils have little oxygen, so dead plants decay very slowlyThey have more plants than other ecosystemsThey receive more rainfall than forestsThey are located near the ocean

What are decomposers?

Plants that grow in wetlandsOrganisms that break down dead plant and animal materialTypes of carbon stored in soilWater particles in wetland soils

What is blue carbon?

Carbon found in the atmosphereCarbon stored in forestsCarbon captured and stored by coastal and marine ecosystemsCarbon released by decomposers

According to the passage, coastal wetlands cover less than two percent of ocean area but may account for what portion of carbon buried in ocean sediments?

One quarterOne thirdHalfThree quarters

What happens when wetlands are drained?

Carbon storage increases rapidlyOxygen enters the soil and decomposers break down stored plant material, releasing carbon dioxideThe wetland becomes a better carbon storage systemNew plants grow faster than before

Based on the passage, why do mangrove forests store large amounts of carbon?

They grow very tall treesThey receive the most sunlightThey have dense root systems that trap sediment and organic matterThey are always underwater

What can scientists infer about the relationship between oxygen and carbon storage in wetlands?

More oxygen leads to better carbon storageOxygen levels do not affect carbon storageLow oxygen levels slow decomposition and allow carbon to accumulateOxygen helps plants grow faster in wetlands

If a city drains a wetland to build houses, which outcome is most likely based on the passage?

The carbon will remain safely stored in the soilThe wetland will store even more carbonCenturies of stored carbon will be released as carbon dioxideNew wetlands will form nearby

True or False: Peatlands cover three percent of Earth's land surface but store twice as much carbon as all the world's forests combined.

TrueFalse

True or False: When water returns to drained wetlands, carbon storage cannot resume because the soil has been permanently damaged.

TrueFalse