Weathering and Deposition
Erosion
Scenarios
Landforms
Constructive, Destructive...
100
What is weathering?
The breaking down of large rock into smaller pieces.
100
What is erosion?
Erosion is the process by which sediment and other materials are moved from one place to another.
Erosion takes, carries, moves, the rock
100
Is the following W, E, or D? Rainwater carrying small rocks down a driveway.
Erosion (Carry's the rock!)
100
This image shows what landform AND what type of WED made it.
U-Shaped Valley - Ice (Glacier)
100
Define constructive forces as they relate to Earth's surface.
Building up of Earth's surface.
200
What is the definition of deposition?
Dropping sediment in a new place.
200
What are the 3 of the 4 different ways rock can be naturally eroded?
Erosion by _____, ______, ______, and ________.
Wind, water, ice, gravity
200
Is the following W, E, or D? Water freezing inside of cracks in the road making the cracks larger and eventually creating potholes.
Weathering (breaks the rock when freezing expands cracks)
200
What landform is shown in the picture, be specific AND what type of WED made this landform?
Landslide (more specifically a SLUMP) made by Gravity
200
Define Destructive Forces as they relate to Earth's surface.
Destruction or breaking down of Earth's surface.
300
What is mechanical weathering?
Physical change or breaking of rock into smaller pieces of the SAME ROCK.
300
Canyons or V-Shaped valleys form from this moving through Earth's surface carrying rock away.
River (Water)
300
Is the following W, E, or D? A large sandstorm stops blowing and all of the sand piles up to form a dune.
Deposition (the wind drops the rock when it stops blowing)
300
This type of water feature is formed when a meander is cut off from the main river or stream.
Oxbow Lake made by Water
300
Rock destroyed into smaller pieces is now called ____.
Sediment
400
What is one landform created by wind deposition?
Sand dunes.
400
What are the two types of erosion that typically cause mudslides and landslides to occur?
Gravity and water.
400
Is the following W, E, or D? A glacier melting at the bottom of a mountain in the summer creating piles of glacial till.
Deposition (the glacier drops all of the rock it was carrying when it melts)
400
The flat area next to a large river or stream where water rises up and erodes rock away during heavy rainfall.
Floodplain made by water
400
Over a long period of time waves can destruct sea cliffs by hitting them over and over. This destructive process eventually constructs what landform?
The sand from the sea cliff will eventually build up to create a beach.
500
What is chemical weathering?
A chemical change that breaks rock down by changing the rock into something else (examples: oxidation on a car makes it rust. The metal's atoms are changed and it becomes rust. Acid rain dissolves the face of a statue away.)
500
More erosion would occur with which type of river? A river with dry sandy soil. A river with compact clay like soil.
A river with dry sandy soil.
500
Is the following W, E, or D? During a flood a person's house, trees, and soil is swept downstream.
Erosion (during the flood the soil is being carried away)
500
This landform is made by deposition. You will see new islands forming where a river enters the ocean.
A delta
500
Give me an example of a natural destructive process.
Freezing and thawing in a rock to break it.
600
In a cave, these are formations of deposition.
Stalagmite, stalactite, column.
600
What are 2 things that erosion can cause streams or rivers to do?
They cause streams to widen and deepen. They carry rock away (erosion) from the sides and the bottom of the river banks. They can also cause them to change shape as they carry rock away.
600
Is the following W, E, or D? Rain hitting rock smooths out pointy mountain peaks over millions of years.
Weathering (the rain breaks the rock to make it smooth)
600
This landform is made when a U-shaped valley fills in with water by the sea.
Fjord
600
You are demonstrating your knowledge to 3rd graders and given the task to make EROSION happen faster in a river model. What are TWO things you could do to achieve this task?
Increasing the gradient by making the tray steeper. Increase the flow of the river by pouring more water through the model or increasing the speed of the water. OR Change the soil type to dry sand soil.