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Some of the oldest known fossils, large reef complexes built by microorganisms, are called:

What process formed the early atmosphere?

The Mesozoic Era is called the “Age of Reptiles” because ____. 

During the Mesozoic, North America was moving ____.​

The Mesozoic Era was geologically busy. Which event did not occur during the Mesozoic?

Greenstone belts are made up of _________ rocks in the lower and middle layers and _________ rocks in the upper layers. 

What were the two sources of surface water on early Earth?

The Tethys Sea closed as _______ moved northward, eventually forming the Mediterranean Sea.

The earliest atmosphere was likely composed of ___________ and __________.

As demonstrated by Stanley Miller’s experiments, what are two possible energy sources for the synthesis of organic molecules?