Vocab
A large mass of ice moving over land.
glacier
Explain why a scientist might find jagged rocks at the start of a stream, near a mountain.
The rocks would be jagged because they may have just broken off of the rock. These rocks haven't been weathered by water yet.
This type of weathering causes rocks to break, but they do not change in any other way.
Physical weathering
Sediments are being carried down the river or carried by wind.
Is this erosion or deposition?
erosion
The process by which rocks crack and break apart over time.
weathering
Explain why a scientist might find smooth rocks at the end of a river.
The water rushed over the rocks, causing them to become smoother and smoother.
This type of weathering causes the minerals in rocks to change into new substances. Sometimes it causes holes to form in rocks.
Chemical Weathering
Earth materials settling at the mouth of a river to form a river delta
Is this weathering or deposition?
deposition
The settling of sediment.
deposition
These two rocks are affected by acid rain.
(We saw this in our lab)
limestone and marble
We shook conglomerate and granite rocks in jars to model this type of weathering.
Physical Weathering
What are the ways sediment is carried during erosion?
water, wind, ice
The carrying away of weathered earth materials by water, wind, or ice
erosion
List at least 2 causes of chemical weathering.
acid rain, salt water, and chemicals in the air or water
In our investigation in which we shook conglomerate and granite rock. Which rock broke down more?
conglomerate
Explain "W.E.D."
W = weathering, the breaking down of rocks
E = erosion, the carrying of sediment
D = deposition, the settling of sediment
Pieces of weathered rock
sediment
List at least 3 causes of physical weathering:
water freezing in cracks of rocks, gravity causing rocks to fall, wind moving sand over the surface of a rock, water running over rocks, abrasion, animals scratching at rocks, roots of plants breaking rocks
We placed different rocks in vinegar to model which type of weathering?
Chemical Weathering
Explain how weathering, erosion, and deposition can form new land forms.
Weathering breaks rocks down to create sediment. Erosion carries this sediment from one place to another. Once the sediment settles, a new land form is created through deposition.
Examples: Sand dunes, river deltas, and beaches (form through deposition)