Weathering
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Weathering PowerPoint PPT Presentation


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Weathering is a process that breaks down rocks on Earth’s surface. Two main types: Mechanical (Physical) Chemical. Weathering. Rock is PHYSICALLY broken into smaller pieces Can be caused by: Freezing and thawing Plant growth. Mechanical/Physical Weathering.

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Weathering

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Weathering

  • Weathering is a process that breaks down rocks on Earth’s surface.

  • Two main types:

    • Mechanical (Physical)

    • Chemical

Weathering


Mechanical physical weathering

  • Rock is PHYSICALLY broken into smaller pieces

  • Can be caused by:

    • Freezing

      and thawing

    • Plant growth

Mechanical/Physical Weathering


Causes of physical weathering con t

  • Abrasion (grinding away of rock by other rock particles)

  • Actions of animals

Causes of Physical Weathering (con’t)


Chemical weathering

  • When rocks undergo chemical

    changes (the minerals that

    make up the rock change)

  • Occurs due to:

    • Water (dissolves minerals in the rocks)

    • Oxygen (rocks containing iron go

      through oxidation, producing rust)

    • Acids (acid rain, other sources)

      – quickly weathers rocks

Chemical Weathering


Rate of weathering

  • Depends on:

    • Size - Smaller pieces of rock weather faster (more surface area)

    • Type of rock – different rocks contain different minerals that weather at different rates

    • Climate – wet climates and warm climates cause faster weathering

Rate of Weathering


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