1. How is weathering different from erosion?
Weathering disintegrates rocks, it breaks them into pieces. Once these sediments are separated from the rocks, erosion is what moves these sediments.
2. What do weathering and erosion accomplish together?
The turn mountains and large hills into small, flat plains because of all the time of wearing them down and erosion.
1. Click on the picture of the snail. Explain biotic erosion.
Friction from the animal rubbing against the rocks causes them to erode away.
2. Click on the picture of the tree. Explain how chelation works.
The acids that break down the plant material also breaks down some compounds in the rocks causing erosion.
3. Click on the picture of the rain clouds and the sun together. How does hydration work?
Together, the sun and rain soften the rocks due to OH and H ions in the rocks and then the rock is weathered easily.
4. Click on the picture showing the chemical abbreviation of oxygen (lower left). How does oxidation work?
The oxygen weakens the ions which makes to more vulnerable to weathering.
5. Click on the picture of the mountains. How does freeze-thaw work?
The water hits the granite, the temperatures lower at night and freezes the rain. Then it widens the splits in the granite until it breaks off, then the weathering takes places and erodes parts of the granite.
6. Click on the image of the Sun. How does mechanical weathering work?
Since the rock is exposed it disintegrates by the forces of nature, contracting and expanding.
1. Three types of mechanical weathering are shown here. Generally, they all work together. Distinguish between the four types of mechanical weathering.
Abrasion is when rocks rub together.
Mechanical Exfoliation is when rocks break off and pressure change causes inner rocks to change.
Thermal Expansion and Contraction is when materials expand or contract when subjected to changes in temperature. Most materials expand when they are heated, and contract when they are cooled.
Frost Wedging is mechanical weathering in which rocks are broken by the expansion of water as it freezes in joints, pores, or bedding planes.
2. In what type of rock does dissolution occur? What are some of the features that form from dissolution?
Dissolution occurs in limestone because of acidic water, this lets additional water enter.
3. How does hydrolysis work? How does clay form?
When silicate minerals weather, they create clay minerals such as kaolinite.
4. What factors can influence chemical weathering?
Living organisms, climate, time, and mineral composition.
Watch the Bill Nye video. List the various demonstrations Bill Nye performs to simulate different types of erosion. Add a 1-2 sentence description for each.
When he was doing frost wedging, the nitrogen broke the glass bottle.
For abrasion, the air wore down the mountains.
With dissolution, the water wore down the rock over a series of time.