Nature Walk
By: Haley Kable, Madison Newsome, Olin O'Neal
What we will be talking about today:
Today we will be talking about Chemical Weathering and Mechanical Weathering. Also erosion by water & erosion by gravity and depostion by wind & deposition by ice.
Chemical Weathering
Chemical weathering takes place in almost all types of rocks. Chemical reactions break down the rocks, causing them to fall apart, forming smaller pieces. One example is oxidation or rust which happens when water and carbon dioxide mix and create carbonic acid.
Mechanical weathering
Mechanical weathering is the process of breaking big rocks into little ones. This process usually happens near the surface of the planet. Temperature also affects the land. That movement can cause rocks to crack and break apart.
Examples of Erosion
Water Erosion
This is an example of water erosion. Water has seeped through the cracks of a mountain and has formed for millions of years and created a canyon. The cliffs form because harder rock that are resistant to erosion and weathering remain exposed on the valley walls.
Gravity Erosion
This is an example of erosion by gravity. A landslide happens when a large amount of soil and rock suddenly falls down a slope because of gravity. Landslides can very very destructive in many ways. It may bury or carry away entire villages.
Examples of Deposition
Wind Deposition
This is an example of Deposition by wind. Like water, when wind slows down it drops the sediment it's carrying. A rock or tree may cause wind to slow down. As the wind slows, it deposits the largest particles first. Different types of deposits form depending on the size of the particles deposited.
Ice Deposition
This is an example of deposition by ice. Glaciers deposit their sediment when they melt. They drop and leave behind whatever was once frozen in their ice. It’s usually a mixture of particles and rocks of all sizes, called glacial till . Water from the melting ice may form lakes or other water features.