How do weathering and erosion shaped earths surfas?.pptx

Grade 5

1. Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface? Copyright © Houghton Mifflin Harcourt Publishing Company

2. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface? What Can Break a Boulder? The process of rock breaking apart is called weathering . Many things cause weathering, such as gravity, flowing water, blowing sand, living things, wind, rain, and chemicals.

3. Copyright © Houghton Mifflin Harcourt Publishing Company Rocks on the Move Weathering is the beginning of a series of changes that often occurs to rocks on Earth’s surface. The process of moving weathered rock from one place to another is called erosion . Moving water is one of the most common causes of erosion. Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface?

4. Copyright © Houghton Mifflin Harcourt Publishing Company Rocks on the Move Fast-moving water and gravity can cause rocks to move downhill. As the water in a river slows down, it has less energy and cannot move the largest rocks and pebbles. The dropping of weathered rock by wind or moving water is known as deposition . Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface?

5. Copyright © Houghton Mifflin Harcourt Publishing Company Rocks on the Move Slow-moving water has less energy than fast-moving water has. Thus, as water in a river continues to slow down, more bits of weathered rock are dropped. Slow-moving water carries only very small pieces of rock, such as sand and silt, called sediment . When rivers reach the ocean, they slow down even more and sediment is dropped. Over time, the sediment forms a landform called a delta . Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface?

6. Copyright © Houghton Mifflin Harcourt Publishing Company Rocks on the Move What size of sediment drops out first? What size drops out last? Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface?

7. Copyright © Houghton Mifflin Harcourt Publishing Company Blowing in the Wind A landform is a natural land shape or feature. Weathering and erosion by wind change landforms. Wind can carry sediment from place to place. When wind deposits a lot of sand in one area, sand dunes form. Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface?

8. Copyright © Houghton Mifflin Harcourt Publishing Company Blowing in the Wind Wind sweeps up one side of a dune and lifts sand from its surface. Gravity pulls the sand down the other slope. Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface?

9. Copyright © Houghton Mifflin Harcourt Publishing Company Blowing in the Wind Blowing sediment can also cause changes to other landforms as particles collide with exposed rock to form interesting shapes. For instance, mushroom rocks and arches are formed by water but shaped by the wind. Eventually, gravity pulls these formations down. Unit 8 Lesson 1 How Do Weathering and Erosion Shape Earth’s Surface?