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Earth was a hot, barren, waterless planet during the early Hadean eon.

The nucleus or foundation of a continent, formed during the collision and accretion of volcanic islands, is called a ____.

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. 

What principle did James Hutton develop?

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

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