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Chapter 2: Earth's Spheres and Cycles

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Across
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Most abundant element in Earth's atmosphere
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The gaseous layer above Earth's surface
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occasionally large catastrophes have altered the course of Earth history
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a combination of interacting parts that form a complete whole
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geologic processes operating today also operated the same in the past
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The realm of organisms
Down
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When a system stays constant or changes minimally to stresses until a critical point is reached and then rapid change ensues
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a sequential process of phenomenon that returns to its beginning and then repeats itself over and over
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The rocky part of the Earth, both solid and molten
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Substance necessary for living things and regulating climate on Earth
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geologic change occurs over long periods of time, by a sequence of almost imperceptible events
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The watery, icy part of our planet