Introducing Worky Genie — AI-powered reading passage generator with vocabulary, quiz, flashcards & moreTry it free →

How Matter Cycles Through Earth Systems — Reading Comprehension

No ratings yet

Premium Resource

Grades

Standards

MS-ESS2-1

Rate this resource

Send Feedback / Report an Issue

About This Reader

This comprehensive reading passage explores how matter cycles through Earth's four spheres: atmosphere, hydrosphere, geosphere, and biosphere. Aligned with NGSS standard MS-ESS2-1, students discover how water, carbon, and nitrogen continuously move through Earth's systems without being created or destroyed. The passage uses clear, grade-appropriate language to explain complex scientific concepts including evaporation, condensation, photosynthesis, respiration, and decomposition. Real-world examples help students understand how these cycles work together to maintain life on Earth. The audio-integrated passage includes a simplified version for struggling readers, Spanish translations, comprehensive glossary, multiple-choice questions, writing activities, and graphic organizers. Students engage with cause-and-effect relationships and process sequences to deepen their understanding of Earth's interconnected systems and the law of conservation of matter.

CONTENT PREVIEW

The water cycle demonstrates how water moves between Earth's spheres.. Water Cycle (8265084166) by Atmospheric Infrared Sounder / Wikimedia Commons

Matter on Earth is never created or destroyed. Instead, it moves continuously through Earth's four major systems called spheres. These spheres are the atmosphere (air), hydrosphere (water), geosphere (rocks and soil), and biosphere (living things). Water, carbon, and nitrogen are examples of matter that cycle through these spheres over and over again. Understanding these cycles helps scientists predict weather patterns, manage water resources, and study climate change.

The water cycle demonstrates how water moves between Earth's spheres. Water evaporates from oceans and lakes in the hydrosphere, becoming water vapor in the atmosphere. This process is called evaporation. As water vapor rises and cools, it condenses into tiny droplets that form clouds. When these droplets combine and become heavy enough, they fall as precipitation—rain, snow, sleet, or hail. Precipitation returns water to the hydrosphere and geosphere, where it may soak into soil, flow into rivers, or be absorbed by plants in the biosphere. A single water molecule might spend years in a glacier, days in a river, or minutes in a cloud before moving to another sphere.

The carbon cycle tracks how carbon atoms move through Earth's systems. Plants in the biosphere absorb carbon dioxide from the atmosphere during photosynthesis, using sunlight to convert it into sugars and oxygen. Animals eat plants and release carbon dioxide back into the atmosphere through respiration, or breathing. When organisms die, decomposers break down their bodies, returning carbon to the soil in the geosphere. Over millions of years, some of this carbon becomes fossil fuels like coal and oil. When humans burn these fuels, carbon returns to the atmosphere as carbon dioxide. Carbon also dissolves in ocean water, where marine organisms use it to build shells that eventually become limestone rock.

The nitrogen cycle moves nitrogen through Earth's spheres in several steps. Although nitrogen gas makes up 78 percent of the atmosphere, most living things cannot use it in this form. Special bacteria in soil and plant roots convert atmospheric nitrogen into compounds that plants can absorb. This process is called nitrogen fixation. Plants use these nitrogen compounds to build proteins. When animals eat plants, nitrogen moves into the biosphere. When organisms die and decompose, bacteria break down nitrogen compounds and release some nitrogen back into the atmosphere. Lightning also converts atmospheric nitrogen into forms that dissolve in rain and enter the soil.

These cycles work together to maintain conditions necessary for life on Earth. The same atoms of carbon, nitrogen, and oxygen that exist today have cycled through Earth's systems for billions of years. A carbon atom in your body might have once been part of a dinosaur, a tree, or ocean water. This continuous cycling follows the law of conservation of matter, which states that matter cannot be created or destroyed in ordinary processes. Understanding how matter cycles helps scientists track pollution, manage natural resources, and predict how human activities affect Earth's systems.

Interesting Fact: Scientists estimate that the water you drink today has been cycling through Earth's systems for about 4 billion years, meaning you might be drinking the same water molecules that dinosaurs drank millions of years ago.

What are the four spheres of Earth mentioned in the passage?

Atmosphere, hydrosphere, geosphere, and biosphereAir, water, land, and spaceOceans, mountains, forests, and desertsNorth, south, east, and west hemispheres

According to the passage, what happens to matter on Earth?

It is constantly created and destroyedIt moves continuously through Earth's spheres without being created or destroyedIt only exists in the atmosphereIt disappears into space over time

What is evaporation?

When water vapor turns into liquid waterWhen rain falls from cloudsWhen liquid water changes into water vaporWhen ice melts into liquid water

In the carbon cycle, how do plants use carbon dioxide?

They release it through their rootsThey convert it into sugars and oxygen during photosynthesisThey store it in the soilThey breathe it out like animals do

Why can't most living things use nitrogen gas directly from the atmosphere?

There is not enough nitrogen in the atmosphereNitrogen is poisonous to living thingsMost living things cannot use nitrogen in its gas formNitrogen only exists in the ocean

What role do bacteria play in the nitrogen cycle?

They destroy nitrogen completelyThey convert atmospheric nitrogen into forms plants can useThey prevent nitrogen from entering the soilThey release nitrogen into space

According to the law of conservation of matter, what happens to atoms on Earth?

They are created and destroyed constantlyThey cannot be created or destroyed in ordinary processesThey only exist in living thingsThey disappear after a few years

How does carbon return to the atmosphere when humans burn fossil fuels?

As oxygen gasAs nitrogen compoundsAs carbon dioxideAs water vapor

True or False: A single water molecule can move between different spheres of Earth.

TrueFalse

True or False: The carbon atom in your body today has never been part of anything else.

TrueFalse