Erosion
What is Erosion?
The process by which earths materials are moved by natural forces.
What is Weathering?
The breaking down of Earth's materials by natural forces.
What is deposition?
When sediment is carried from one place to another place.
Broken pieces of rock are called what?
Sediment
What is the major difference between mechanical and chemical weathering?
Mechanical weathering changes the shape of a structure.
Chemical weathering changes the color of a structure.
Strong winds blow away sediment from a mountain over a long period of time. What is this called?
Wind Erosion
Over the years people have noticed that the outside stone of a very old home has changed from brown to green. What type of weathering most likely took place?
Chemical weathering.
If a 10lb stone and a 5lb stone are swept away by water erosion. Which stone will be deposited last and why?
The 5lb stone. Since it is lighter or has less mass, it will be carried further and be the last to be deposited.
I am more likely to see large cracks and broken off pieces of rock because of which type of weathering?
Mechanical weathering
Which of the following material will usually settle first:
Sand, soil, gravel, water?
Gravel will settle first since it is the heaviest of the materials.
Over many years water broke apart rock and carried sediment away from a mountain forming tunnels. What type of erosion most likely occurred?
Water Erosion
My friends and I used to hike up a cube shaped mountain. Over the years that cube shaped mountain has now become more of a triangular shape. What type of weathering could have caused this?
Mechanical weathering
What does settle mean?
To place or deposit something in an area.
What is soil?
A mixture of air, water, organic matter, minerals, and rock particles.
How are icebergs formed?
When glacial erosion happens and a piece of the glacier falls off the mountain into the ocean.
A large body of ice formed on top of a mountain. Over the years that large body of ice began sliding down the mountain carrying rocks and dirt along with it as it melts. What type of erosion is happening?
Glacial Erosion
The Statue of Liberty is a good example of what kind of weathering?
Chemical weathering
How fast a river is moving does NOT affect deposition. True or False.
False. The faster it is moving the more force it has to push sediment even further away.
What most likely caused the Grand Canyon to form?
Water erosion
Does Erosion take a long or short time to happen?
Long time
What type of erosion is most likely to occur in a hot, dry desert?
Wind Erosion
Can weathering and erosion happen together?
Yes, remember our sea stacks. Weathering broke down pieces of the structure that were once part of a cliff while erosion swept away sediment changing the landscape.
Water erosion occurs and picks up 3 rocks. Rock A weighs 5lbs, Rock B weighs 2lbs and Rock C weighs 12lbs. In what order will they deposit?
C-A-B. They will deposit from heaviest to lightest.
What is a large body of ice called?
Glacier
In a slow moving river will sediment be carried and deposited the same as in a fast moving river?
No, since the river is slow moving it will have less force than a fast moving river. Therefore the sediments will not be carried at the same rate.