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Chapter 1 - Lesson 1 Shaping Earth’s Surface/ People Change the Land

This chapter explores the various agents of weathering that shape Earth's surface, such as water, ice, wind, and human activities. Learn about erosion, deposition, and how humans impact the physical environment.

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Chapter 1 - Lesson 1 Shaping Earth’s Surface/ People Change the Land

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  1. Chapter 1 - Lesson 1 Shaping Earth’s Surface/People Change the Land Chapter 1 The World’s Geography

  2. Shaping Earth’s Surface page 23 • There are several ways that the Earth’s surface can change • Weathering is a way the Earth’s surface is changed Weathering - is the process of breaking up rocks into smaller pieces called sediment

  3. Shaping Earth’s Surface • Water is an agent of weathering • Moving water tumbles rocks against each other, breaking them into pieces • In this way moving streams and rivers weather away land and produce canyons

  4. Shaping Earth’s Surface • Ocean waves weather away sea cliffs, turning them into beach sand or causing them to fall into the sea

  5. Shaping Earth’s Surface • Moving Ice in the form of glaciers can also change landforms • Glaciers are thick sheets of ice formed in areas where more snow falls than melts • As glaciers move, they grind the land below them, causing the land to “weather” away beneath them

  6. Shaping Earth’s Surface • Wind is another agent of weathering • Strong, steady wind carrying sand can grind hard desert rock. Rainbow Bridge, Utah

  7. Shaping Earth’s Surface Erosion – the process of moving sediment Deposition – the process of dropping, or depositing sediment in a new location After the weathering has broken socks into sediment, erosion and deposition move the sediment to new places.

  8. Shaping Earth’s Surface Delta – a triangle shaped piece of land at the mouth of a river Floodplain – the land next to the river Erosion and deposition make landforms bigger and produce new landforms Example: Rivers pick up sediment as they move downstream. Then the river floods and it deposits that sediment in flat areas along the river banks. These deposits add to the floodplain A river can also deposit sediment at its mouth creating a triangle-shaped piece of land called a delta

  9. Shaping Earth’s Surface • Diagram of erosion (water)

  10. Shaping Earth’s Surface • Some examples of erosion

  11. Shaping Earth’s Surface • Diagram of deposition

  12. Shaping Earth’s Surface • Some examples of deposition

  13. What physical processes shape landforms? (pg.24)

  14. People Change the Land pg.25 • Human activities also change the Earth’s surface • The floodplains and deltas that weathering, erosion, and deposition create, humans use as farmland • In Asia, people grow rice on the sides of mountains by cutting into the slopes forming flat fields along the side, this prevents erosion and keeps water on the field

  15. People Change the Land

  16. People Change the Land People build dams to control the flow of rivers and produce electricity Lakes are also created to store water People drain wetlands of their water in order to make dry land to build cities and farms. Humans also direct water into dry areas to make it possible to live in dry areas of the world

  17. People Change the Land

  18. Terms to Know • Weathering • Erosion • Deposition • Floodplain • delta • What are some ways in which people change the physical environment? (pg. 25)

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