Chapter 23: Earth’s Changing Surface. Objectives: What is weathering & erosion? Give examples of mechanical and chemical weathering. How do weathering & erosion change Earth’s surface? How do you “read” sedimentary rocks that are formed as a result of erosion and deposition?. Weathering.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Chapter 23: Earth’s Changing Surface
What is weathering & erosion?
Give examples of mechanical and chemical weathering.
How do weathering & erosion change Earth’s surface?
How do you “read” sedimentary rocks that are formed as a result of erosion and deposition?
Weathering by wind and water causes rocks to break apart into smaller pieces or SEDIMENTS (SEDIMENT = END PRODUCT).
1. Mechanical – Rocks are broken apart physically
Examples of Mechanical Weathering
1A. Frost Wedging
Frost Wedging creates rock spires and pot holes.Frost wedging happens in environment where temperatures alternate between hot and cold or where there are seasons
1B. Abrasion =
Wind or water SCRAPES the surface of rock to break it up.
1 C. Plant roots – help break apart rocks
Rocks containing calcium (limestone, marble, etc.) dissolve in acidic water.
Rain can be acidic because of dissolved carbon dioxide (carbonic acid)
Caves form in limestone rocks. Water seeps through ground and dissolves rock to form caverns.
Erosion is when the sediments (made by weathering) are carried awayto a new location by wind or water.
AGENTS OF EROSION:
Types of Mass Movement (aka, mass wasting)
Layer A was laid down first.
Then layer B.
Layer I is the most recent.