Which epoch are we currently in?

Absolute time is stated in years.

Relative time is

The Hadean Eon was a calm time in Earth's history.

Reptiles like dinosaurs were the dominant creature in...

The principle of superposition states that

During which eon did cyanobacteria evolve?

The Cenozoic Era is known as the

Inclusions are younger than the rocks that contain them.

Radioactive isotopes become stable when they

What event occurred to end Precambrian time?

The Impact Hypothesis states that a large asteroid hit Earth and triggered climate change.

The time required for half of the atoms in any sample of an unstable isotope to decay is called

What did cyanobacteria do for our planet?

Gaps in the rock record are called

The largest mass extinction to ever happen on Earth was the

What is an interglacial period?

The longest length of time on the geologic time scale is

Which is not a period of the Mesozoic Era?

The Permian extinction occurred at the same time as the largest known volcanic eruption.

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