Transcript Chapter 6 Lesson 2 ppt

Lesson 2
Wearing Down Earth’s Surface
Pages C14-C18
Weathering
• Mechanical
• Chemical
Mechanical
• Breaking larger rocks into smaller pieces
called “sediment”
• Mechanical Weathering - Geology For
Kids - By KidsGeo.com
• Causes: wind, water, living things
• DOES NOT CHANGE MATTER!
Chemical
• Rocks change into new matter
• Water is the main factor
• Water dissolves some chemicals from the
air and soil to form a weak acid.
• Limestone and Marble- easily dissolve
•
• Prince Edward Island
Red Sands
Caves
• Weak acids formed in rainwater seep into the
ground
• Acids dissolve rock.
• Holes are formed
• Over time holes get bigger= CAVE
• CAVE ANIMATION
• CAVE DIAGRAM
Erosion
• CAUSE/weathering
• EFFECT/erosion
• Carrying away of sediments by moving
water, wind, or moving ice
• EROSION SONG
Erosion
• Main cause- moving water
• Can increase the size of a river channel
Glacial Deposits
Sinkholes
• Sinkhole Animation
Landslides
• Picture of Landslide
• Causes: strong rain, gravity, earthquakes,
volcanoes