1. Chapter 1 - Lesson 1 Shaping Earth’s Surface/ People Change the Land
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
After the weathering has broken socks into sediment, erosion and deposition move the sediment to new places.
Erosion – the process of moving sediment
Deposition – the process of dropping, or depositing sediment in a new location

8. Shaping Earth’s Surface
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
Delta – a triangle shaped piece of land at the mouth of a river
Floodplain – the land next to the river

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)