Guided Notes For Chapter 8 – 1 Changing Earth’s Surface
Wearing Down and Building UpWhat processes wear down and build up
Earth’s surface?
Erosion – The process by which natural forces move weathered rock from one place to another.
Sediment is the material moved by erosion.Weathering and erosion produce sediment.
• .
Deposition – The area where sediment is laid or deposited. Deposition changes the
shape of land.
Weathering, Erosion & Deposition act together to wear down and build up
Earth’s surface.
Mass Movement – Gravity is the force pulling rocks and other materials downhill.
• Four types of Mass Movement:• LANDSLIDES• MUDSLIDES• SLUMP • CREEP
Landslide – (The most destructive) When rock and soil move quickly down a steep
slope.
• El Salvador, 2001
Landslide
A Mudflow is the rapid downhill movement of a mixture of water (60%), rock and soil.
Mudflow
Mudflowhttp://www.youtube.com/watch?v=n1cCs-S5EKc
Slump refers to the sudden movement of one large mass of rock and soil.
SLUMP!
Creep is the very slow downhill movement of rock and soil.
Landslide videoQuick Clay Landslide – Iceland 21:17http://www.youtube.com/watch?v=3q-qfNlEP4A
Landslide – Slump 1:53http://www.youtube.com/watch?v=CvOUygzBmOo
Mudslide – Keystone Colorado 4:13http://www.youtube.comwatch?v=CyY3bCV8K-M