Notebook Setup On page 32, glue down the “Weathering and Erosion” worksheet On page 33, glue down the “Landform Scavenger Hunt” worksheet

Warmup What makes something “good”? What makes it different than something “bad”?

Weathering and Erosion

Weathering The gradual breakdown of the materials of Earth’s crust into smaller pieces through chemical or mechanical processes.

Physical Weathering Process by which rocks are broken down into smaller pieces by external conditions. Types of physical weathering are: Frost wedging and frost heaving Plant roots Friction and impact Burrowing of animals Temperature changes

Frost Wedging

Frost Heaving

Plant Roots

Friction and Repeated Impact Breaks off pieces of rock, and gradually forms smooth round rocks found in stream beds or along lake shores.

Burrowing of Animals

Temperature Changes

Chemical Weathering The process that breaks down rock through chemical changes. The types of chemical weathering are: Water Oxygen Carbon dioxide Living organisms Acid rain

Water Water weathers rock by dissolving the minerals

Oxygen Iron contained in rock combines with oxygen in the presence of water in a processes called oxidation The product of oxidation is rust

Carbon Dioxide CO2 dissolves in rain water and creates carbonic acid Carbonic acid easily weathers limestone and marble

Living Organisms Lichens that grow on rocks produce weak acids that chemically weather rock

Acid Rain Compounds from burning coal, oil and gas react chemically with water forming acids. Acid rain causes very rapid chemical weathering

Erosion The process by which water, ice, wind or gravity moves fragments of rock and soil.

Water Erosion Rivers, streams, and runoff Delta-a fanlike deposit of sediment where a river enters an ocean/sea.

Ice Erosion Glaciers-large long lasting mass of ice that moves due to gravity and plucks rocks and boulders and scourers valleys smooth.

Glaciers Creates U-Shaped valleys Moraine-piles of rocks that form hills or ridges that are left behind/deposited once a glacier has melted or receded. Kettles- small glacial depressions that fill with water to form small lakes

Wind Erosion Winds must be 11 mph to move sediment. Dust storms can move 6,000 tons per cubic mile of air. Loess: windblown silt and clay that produces very fertile soil (Mississippi, N. China, Argentina)

Mass Movements Landslides, mudslides, slump and creep landslide clip.mpeg

Activity Using your atlases, draw a picture of the landform you are given and find an example in the world