What process did geologistsuse to determine that the Earth is 4.6 billion years old?

Scientists used rocks from the _______ to determine the age of the Earth.

What process helped form Earth's early atmosphere and the oceans?

Which of the following are small and contain no nuclei?

The first evidence of multicellular animals comes from

The oxygen contained in the atmosphere comes mainly from

What is the main difference between eukaryotic and prokaryotic cells?

What era are we living in?

At the end of what eon did the first continent form?

Why was the earth so hot in its early days?

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