Geology is the study of the ____, chemical and mechanical changes that ____on its ____ and in its interior, and the history of the planet and its ____ forms. They can ____ how events and processes of the past might ____ the future. If you could drive a magical ____ from the center of the Earth to the surface. These are the driving forces that raise mountains, cause____, and produce volcanic eruptions. It includes the ____solid Earth, the hydrosphere, and the ____ parts of the atmosphere. Scientists generally agree that the Earth formed by ____ of small ____. Crust ____ the oceans differs from that of continents. ____ thickness of continental crust is about 20 to 40 kilometers. The uppermost mantle is ____ cool and ____is hard. At a depth, ____ from about 75 to 125 kilometers. It is a sphere with a radius of about 3470 kilometers and is composed largely of iron and nickel. The outer core is ____ because of the high temperature in that region. The extreme pressure overwhelms the temperature effect and compresses the inner core to a solid.

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