2. Do Now!!!
Take a notes packet and start looking up the vocab

3. Objective!!!
You will learn to explain the differences between erosion and deposition.

4. Do not copy the words typed in this color

5. chapter 3
Erosional Forces

6. Erosion and Deposition
Erosion is the process that wears away surface materials & moves them from one place to another

7. Other agents of erosion, are water, wind, and glaciers.
Gravity is the force of attraction that pulls all objects toward Earth’s center.
Other agents of erosion, are water, wind, and glaciers.

8. One common aspect… they all need ENERGY!!!
Agents of Erosion
1. gravity
3. wind
4. water
2. glaciers
One common aspect… they all need ENERGY!!!

10. Water and wind erode materials only when they have enough energy of motion to do work. A strong wind can move dust and even larger particles.
Glacial erosion works by slowly moving sediment that is trapped in solid ice.
As ice melts, sediment is deposited, or dropped.

11. Deposition
Agents of erosion drop the sediments they are carrying as they lose energy. This is called deposition.
When sediments are eroded, they are not lost from Earth—they are just relocated.

13. Rocks and other materials, especially on steep slopes, are pulled toward the center of Earth by GRAVITY.
A mass movement is any type of erosion that happens as gravity moves materials downslope.

14. Common types of mass movements include slump, creep, rockfalls, rock slides, and mudflows.
Landslides are mass movements that can be one of these types or a combination of these types of mass movements.

15. When a mass of material slips down along a curved surface, the mass movement is called a slump.

16. Slump happens when water moves to the base of a slipping mass of sediment.
Or, if a strong rock layer lies on top of a weaker layer —commonly clay—the clay can weaken further under the weight of the rock.
A curved scar is left where the slumped materials originally rested.

17. Leaning trees and human-built structures is creep.
Creep occurs when sediments slowly shift their positions downhill.
Creep is common in areas of frequent freezing and thawing.

18. Let's Review...
1. A is any type of erosion that happens as gravity moves materials downslope.
are mass movements that can be one of these types or a combination of these types of mass movement.