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A LITTLE SOMETHING WORTH KNOWING

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ScienceOne small ahaEarth or weather concept

This cycle transforms rock among igneous, sedimentary, and metamorphic forms.

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Your new ahaRock Cycle

Rock Cycle — type: Geological process. Source: Rock cycle ↗

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More from Earth & Weather

A few more worth knowing.

  1. 18This earlier theory proposed that continents had moved apart from a single ancient landmass.RECALL
    Continental Drift

    Continental drift proposed a single ancient landmass, an idea later explained more fully by plate tectonics.

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  2. 19This natural atmospheric warming effect involves absorption and re-emission of infrared radiation.RECALL
    Greenhouse Effect

    The greenhouse effect traps heat near Earth's surface and, in its natural form, keeps the planet warm enough for life.

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  3. 20This stratospheric region absorbs much of the Sun's harmful ultraviolet radiation.RECALL
    Ozone Layer

    The ozone layer absorbs most harmful ultraviolet radiation, and a hole over Antarctica was traced to certain man-made chemicals.

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