Weathering and Soil Formation

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Presentation transcript:

Weathering and Soil Formation SWBAT identify processes that break rock apart; describe processes that chemically change rock; explain how soil evolves.

Weathering Weathering Quick Review: a mechanical or chemical surface process that breaks rocks into smaller pieces. Quick Review: What is the difference between a physical or mechanical change and a chemical change?

Mechanical Weathering does NOT change them chemically. What are two causes of mechanical weathering? Ice wedging Water seeps into cracks then freezes creating larger cracks. Plants and animals Animals burrow into ground Plant roots break up the ground

Chemical Weathering Chemical weathering when the chemical composition of rock changes. What type of climate is causes chemical weathering to happen the quickest? Tropical regions where it is moist and warm

Chemical Weathering What are 3 things that can cause chemical weathering? Natural acids Formed when water mixes with natural elements such as carbon dioxide Plant acids Plants produce tannin which can form into an acid that can dissolve minerals Oxygen Can cause chemical changes through oxidation

Soil Soil What 5 factors affect soil formation? a mixture of weathered rock, organic matter, water, and air that supports plant life. What 5 factors affect soil formation? Parent rock Slope of land Climate Time Organisms

Soil Topography For Tomorrow: surface features bring in a sample of soil from around your house, for an in class activity.

Homework: On a separate sheet of paper answer self check questions 1-5 on page 321. Be sure to use complete sentences. You may work with a partner.