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COURSE LECTURE NOTES:

| SCIENCE | MATTER | SOLAR SYSTEM | PLANETS | ATMOSPHERE | WIND and TEMPERATURE | HUMIDITY | WEATHERING | SOIL | SEASONS | MASS WASTING | SEASONS and CLIMATE | WIND WORK | STREAMS | LAND FORMS | GROUND WATER | CAVES/KARST | THE OCEAN | TIDES & ESTUARIES | WAVES | GLACIERS | GLACIAL LANDFORMS | VOLCANOES | VOLCANOES | CHON | PLATE TECHTONICS | EARTHQUAKES | ROCKS | CLIMATE CHANGE |

WEATHERING

Weathering – disintegration and decomposition at or near the Earth's surface, decomposition is the most complicated of the two

    1. chemical weathering – decomposition, change a substance into something else, for instance, the result of exposure of rock to rain, wind, etc. might change rock to rust (oxidation) (Fe2O3) and clay minerals. The reason cars and houses are painted (for protection from elements).

    2. physical/mechanical weathering - disentegration, breaking objects into smaller objects/pieces


    3. organic activity – weathering caused by living things, i.e. trees, people.


Drastic heating then rapid cooling will also cause rock to break. Usually associated with forest fires.

Roll of water in chemical weathering:

    1. water in chemical weathering enables reaction (gets chemicals together and/or is evolved in the reaction). Warm temperature + moisture = faster reaction.

    2. Critical in organic activity. All life needs water. The more physical weathering the more rock surface for chemical weathering. The more chemical weathering the more things can break apart.

Weathering goes on no matter what. People weather too.

Products of weathering:

    1. regolith – loose rock material at the surface, will not support living things.
    2. soil- mixture of regolith, water, air, and organic material that support plant life.

Organic material – living things

    1. humus – black/brown product of decay.
    2. worms, fungi, bacteria, etc. bacteria is need to make ionic nitrogen.

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