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The Moon formed during the Big Bang. 

What is the largest eon in geologic time? 

During the Hadean, volcanic island arcs collided and formed:

Relative dating of geologic events was not possible before the discovery of radioactivity in the late 19th century.

Depositional environments have unique physical, biologic and chemical processes. 

Short-term climatic changes, such as the Little Ice Age, may be caused by:

What principle did James Hutton develop?

The Andes Mountains formed when a formerly passive margin became active and an oceanic-continental collision occurred.

Metamorphic rocks are rocks altered by heat, pressure or fluid activity.

What occurred 14 billion years ago?