1. This is your Homework! Put it somewhere safe.
Bell Ringer:
Please take out your IAN and the copy of Deposition Reading in your blue tub.
This is your Homework! Put it somewhere safe.

2. Ch.12 Erosion and Deposition
Objectives: Introduce new erosion & deposition
1) Waves
2) Wind
3) Glaciers
4) Mass Movement

3. Wave Erosion Landforms created: Beaches Cliffs Sea stacks
Waves continuously break rock into smaller pieces.
Landforms created:
Beaches
Cliffs
Sea stacks

4. Wave Erosion Features

5. Wave Deposition Waves carry sand, rock fragments, and shells.
This gets deposited on a shoreline .
This creates a beach.
Longshore currents moves parallel to a shoreline, moving sediment in a zig-zag pattern

6. 3 Types of Wave Deposition
A sandbar is an underwater or exposed
ridge of sand, gravel, or shell material.
A barrier spit is an exposed sandbar that is
connected to the shoreline. Cape Cod,
MA is an example of a barrier spit.

7. A barrier island is a long, narrow island usually made of sand that forms offshore parallel to the shoreline

8. Wind Erosion Plant roots hold soil in place
Wind moves sediment. So what?
Plant roots hold soil in place
Less vegetation, more erosion
Dust Bowl happened this way

9. 3 forms of wind erosion:
Saltation is the skipping and bouncing movement of sand-sized particles in the direction the wind is blowing.
During deflation, wind removes the top layer of fine sediment or soil and leaves behind rock fragments that are too heavy to be lifted by the wind
The grinding and wearing down of rock surfaces by other rock or sand particles is called abrasion.
Abrasion commonly happens in areas where there are strong winds, loose sand, and soft rocks

10. Wind Deposition Wind eventually drops everything it carries
Faster it blows, more it carries.
When it slows, it drops what it carries
EX: sand dunes and loehs

11. Glacier Erosion Glaciers are rivers of moving ice Gravity moves them
They pickup rocks and sediments as they move
Brainpop

12. Glacier Deposition As a glacier melts, it drops what it carries
Glacial drift - all material carried and deposited by glaciers. Glacial drift is divided into two main types, till and stratified drift.

13. Bell Ringer: (soil review)
Please copy down these 5 questions and leave 4 plain lines in between them. You do not need to answer them yet!
What materials do plants need to grow?
What does good soil contain?
Is humus the organic or inorganic part of the soil/why?
What types of things make up the inorganic parts of soil?
List in order of size, from largest to smallest, the inorganic materials in soil.

14. Science Court: Soil https://www.youtube.com/watch?v=xlyfrmOpHDg
Mr. Norton of Gadgetco is about to accept a check from the mayor for $10,000,000. The money is to pay for 10 machines that promise to fix the useless soil at “The Old Dust Field.” But Eddy Watt interrupts.
Eddy claims to have a machine that can do the job, it would cost almost nothing. Let’s take this debate to court: “How can you increase the fertility of soil for free?”

15. Let’s Review:
Why is it important for soil to be made of particles of different sizes?
Why does humus need to be mixed into the deeper layers of soil?
How do plants benefit from the activity of worms?

16. Erosion by Gravity
Mass movement of sediments downhill

17. Gravity causes deposition
Creep, Slump, Landslides, Mudslides, and Avalanches.
Slower
Faster
These are examples of mass movement
(or called mass wasting)

18. Mass Movement Videos Slow mass movement: creep
Rapid movement: landslides, rock falls, mudflows
landslide in Russia
ALPS
Rock fall in France
Avalanche in the Alps
mudslide in British Columbia
Slow mass movement: creep
Creep

19. Brainpop Avalanches