Uploaded September 2026 | Updated September 2026, 2 weeks ago
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Human activities can affect the health of an entire watershed. Some harmful human activities (such as runoff from agriculture, urbanization, deforestation, and water diversions) can cause pollution, erosion, and low-oxygen zones. However, other beneficial human activities (such as sustainable farming, green infrastructure, reforestation, and water conservation) can protect water quality and ecosystems. The Chesapeake Bay shows how actions upstream can have far-reaching effects downstream.
Sections:
00:00 Why is the Chesapeake Bay getting dead zones?
00:40 What is a watershed?
01:26 Agriculture and runoff
02:49 Urbanization
03:29 Deforestation and soil erosion
04:01 Changes to water flow
05:00 How can watersheds be restored?
06:35 Evidence that restoration works
06:57 Summary
TEKS Standards: SCIENCE.7.11, SCIENCE.7.11A
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Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate or volunteer today! Donate here: khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Volunteer here: khanacademy.org/contribute?utm_source=youtube&utm_medium=desc
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:water-and-human-activities/xe25057200abc6bd6:watersheds-and-human-activity/v/watersheds-and-human-activity
Human activities can affect the health of an entire watershed. Some harmful human activities (such as runoff from agriculture, urbanization, deforestation, and water diversions) can cause pollution, erosion, and low-oxygen zones. However, other beneficial human activities (such as sustainable farming, green infrastructure, reforestation, and water conservation) can protect water quality and ecosystems. The Chesapeake Bay shows how actions upstream can have far-reaching effects downstream.
Sections:
00:00 Why is the Chesapeake Bay getting dead zones?
00:40 What is a watershed?
01:26 Agriculture and runoff
02:49 Urbanization
03:29 Deforestation and soil erosion
04:01 Changes to water flow
05:00 How can watersheds be restored?
06:35 Evidence that restoration works
06:57 Summary
TEKS Standards: SCIENCE.7.11, SCIENCE.7.11A
------------------
Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate or volunteer today! Donate here: khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Volunteer here: khanacademy.org/contribute?utm_source=youtube&utm_medium=desc
