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Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

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Page 1: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Weathering

A process that breaks down rocks into smaller fragments.

Mechanical (physical) Weathering Chemical Weathering

Page 2: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Mechanical Weathering

Breaks apart rocks without changing their chemical composition.

Plants Ice

Page 3: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Plants

Roots of plants grow into the cracks of rocks. As the root grows it wedges the rock apart.

Page 4: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Page 5: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Ice Wedging

Water enters a crack in a rock. As the water freezes it expands the crack. When it thaws it goes deeper into the expanded crack. As this process repeats itself the rock eventually breaks.

Page 6: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Page 7: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Chemical Weathering

Occurs when water, air, or other substances react with the minerals in rocks.

Water: hydrogen and oxygen in water react with the chemicals in some rocks and new compounds form.

Acids: Carbonic acid dissolves some minerals.

Page 8: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Rust stain

Page 9: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Chemical Weathering

Acids in Plants: Some plants naturally produce acids which can also dissolve minerals.

Oxygen: reacts with some minerals causing oxidation.

Page 10: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

OXIDATION

Page 11: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Weathering forms Soil

Soil: is a mixture of weathered rock, organic matter, mineral fragments, water, and air.

Page 12: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Soil Profile

Soil is divided into three sections called horizons.

Horizon A: Contains Humus (organic matter turning the soil dark). Humus provides nutrients for plants, providing nitrogen, phosphorus, potassium, and sulfur. Humus also helps soil retain water.

Page 13: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Soil Profile

Horizon B: contains minerals leached from horizon A. Leaching is a process by which materials are removed from soil as they are dissolved in water.

Page 14: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Soil Profile

Horizon C: contains some materials that were leached from horizon B. Horizon C also contains partly weathered rock that is beginning the long, slow process of evolving into soil.

Page 15: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Page 16: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

Page 17: Weathering A process that breaks down rocks into smaller fragments. Mechanical (physical) Weathering Chemical Weathering

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