The energy released from earthquakes and forces that move crustal plates are derived from the internal heat engine.
Liquid water can exist on earth because the orbit is at the proper distance from the sun.
The ozone layer is important to life on earth because it shields living things from uv rays.
Constant change and state of flux on earth is caused by slow moving convection currents in the mantle.
The internal heat of earth is a result of heat from radioactive decay of certain elements.
The main cause of over-use of minerals is expanding populations.
Earth is able to hold life because it has sufficient mass to generate gravity to hold gases.
The winds, ocean currents and hydrologic cycle from solar energy and the external heat engine.
Greatest loss of life comes from landslides and mud flows.
Theory of plate tectonics is a revolution because it shows the planet undergoing constant change.
Crust, upper mantle, asthenosphere, mantle, outer core, inner core.
Geology and......

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Title: Geology
Approximate Word Count: 970
Approximate Pages: 4 (250 words per double-spaced page)

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