This comprehensive middle school science passage explores the concept of watersheds and their role in Earth's water systems. Students learn how a watershed is defined as the land area that drains to a particular river, lake, or ocean, with mountain ridges forming natural boundaries. The passage examines major watersheds like the Mississippi, which drains 40% of the United States through 31 states, and the Amazon watershed spanning 7 countries. Students discover that every location on land sits within a watershed, meaning rainwater from their roof has a specific ocean destination. Aligned to NGSS standards MS-ESS2.C and MS-ESS2-4, this passage includes audio integration, vocabulary development with 8-10 key science terms, and engaging activities that help students understand how water connects different parts of Earth's surface through drainage systems.
Written by Workybooks TeamPublished by Workybooks
Preview
Sample passage and quiz content
CONTENT PREVIEW
Expand content preview
A watershed is the land area that drains water to a specific location. This location can be a river, lake, or ocean. When rain falls on your roof or on a hillside, it flows downhill. The water follows the shape of the land until it reaches a body of water. All the land that contributes water to that destination forms one watershed.
Mountain ridges and hills create natural boundaries between watersheds. Scientists call these boundaries divides. Water that falls on one side of a divide flows to one watershed. Water on the other side flows to a different watershed. Think of a divide like the peak of a roof. Rain landing on the left side runs left, while rain on the right side runs right.
Watersheds can be large or small. A small watershed might drain into a creek that flows through your neighborhood. A large watershed can cover thousands of square miles. The Mississippi River watershed drains about 40 percent of the United States. It collects water from 31 states and channels it to the Gulf of Mexico. The Amazon watershed in South America spans seven countries. It is one of the largest watersheds on Earth.
Every place on land sits within some watershed. Your school, home, and local park all belong to a drainage basin. Evidence shows that water from your roof will eventually reach a specific ocean or lake. The path may be long and complex, but the connection exists. Scientists use watershed maps to track how water moves across the landscape. These maps help them understand how pollution or changes in land use can affect water quality downstream.
Watersheds matter because they connect different parts of Earth's surface through water. Activities in one area can impact water quality far away. For example, fertilizer used on farms in Iowa can travel down the Mississippi River. It may affect water conditions hundreds of miles away in Louisiana. Understanding watersheds helps communities protect their water resources. It also shows how human actions in one location can influence ecosystems in another.
Interesting Fact: The Continental Divide in North America separates watersheds that drain to the Pacific Ocean from those that drain to the Atlantic Ocean. A raindrop falling on one side of this divide may end up in a completely different ocean than a drop falling just a few feet away.
What is a watershed?
A land area that drains water to a specific locationA type of mountain ridgeA river that flows through multiple statesA boundary between two countries
What creates natural boundaries between watersheds?
Rivers and streamsMountain ridges and hillsOcean currentsState borders
How much of the United States does the Mississippi River watershed drain?
About 20 percentAbout 30 percentAbout 40 percentAbout 50 percent
What is another term for watershed?
EcosystemDrainage basinWater cycleRiver system
Based on the passage, why do watersheds matter to communities?
They determine state boundariesThey control the weatherThey connect different areas through water and show how actions in one place affect anotherThey prevent flooding
How can fertilizer used in Iowa affect water in Louisiana?
It cannot affect water that far awayIt can travel down the Mississippi River and impact water quality downstreamIt evaporates before reaching LouisianaIt is filtered out by mountain ridges
What tool do scientists use to track how water moves across the landscape?