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Chapter 2: Earth's Spheres and Cycles

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