Show:
Weathering
Erosion
Think Deep
Sequence
Labs!
100
Name 2 types of mechanical (physical) weathering
tree root wedging, abrasion, frost wedging
100
Weathering breaks it, erosion takes it. What does takes it mean?
Takes it means erosion moves sediments, soil, sand rocks, etc to a new place
100
What is Erosion?
Erosion is the movement of sediments after weathering. It happens by wind, water, ice.
100
What comes first, weathering or erosion?
Weathering
100
Which lab modeled abrasion?
the sugar cube lab
200
After weathering occurs, what is left over from the rocks that have been broken down? Must name at least 2 things
dirt soil
200
Which of the following is an erosion processes? A.Seeds fall into cracks of rocks and as the roots grow the crack expands. B.Waves hit the coast line wearing down rocks and washing sand away. C. Rocks rub together and wear down. Small pieces, called sediment, break off.
B.Waves hit the coast line wearing down rocks and washing sand away.
200
What is weathering?
Weathering is the process of breaking down and weakening sediments that will be moved by erosion.
200
What comes first erosion or deposition?
erosion
200
What represented the wind in the wind erosion lab?
a blowdryer
300
When water goes into cracks in rocks, then freezes the cracks expand. The ice melts as the temperature warms up. When the temperature drops, the water freezes again expanding the crack even more. What is the name of this process?
freeze-thaw cycle
300
Erosion is the movement of sand/soil/rocks. When this "drops" in a new spot it is called______.
deposition
300
Name 2 ways to slow down erosion.
1. barriers 2.planting trees/grass 3.jetties
300
What comes last deposition or weathering?
deposition
300
In the frost wedging lab, what happened to the plaster of Paris and why?
The plaster of Paris cracked because the water inside of the balloon froze and expanded. When it expanded it pushed on the plaster of Paris causing it to crack.
400
When rocks rub together and become worn down or break into smaller pieces this is called______.
abrasion
400
At the beach I noticed new beach grass was planted along the sand dunes. How does this help slow down erosion?
The roots hold the soil/sand to the ground.
400
Can erosion be stopped?
no
400
List in order: deposition, weathering, erosion
weathering, erosion, depostion
400
Describe the changes to the sand pile in the waves erosion lab with at least 2 details.
The sand moved to new locations in the pan, when the waves went over the sand then receded they washed away sand, the pebbles became more visible as the sand moved away, the sand got wetter/more smooth, the height of the pile become smaller
500
Describe tree-root wedging.
Tree root wedging occurs when a seed falls into a crack in a rock. The seed begins to grow into a tree and as the roots grow they cause the crack to expand. Eventually the rock breaks in 2.
500
Describe how flowing water causes erosion
1. Flowing water like a river wears down the rocks along side it. 2. Flowing water moves the sand/soil/rocks at the bottom to a new location.
500
How do erosion and weathering work together?
Weathering breaks down rocks and sediments and then erosion moves them.
500
Finish the chant: _______breaks it, erosion _________, ______ drops
weathering, takes it, deposition
500
During the abrasion lab, what happened to the sugar cubes? Describe with at least 2 details.
The sugar cubes rubbed against each other and wore down, the corners became rounded, the color wore off the edges showing the edges wearing down, small pieces broke off