Understanding Geologic Time-Completion Check

How many billions of years old is the earth?

• 13.7 billion years

• 3.9 billion years

• 4.6 million years

• 4.6 billion years

How long ago did life first appear?

• 13.7 billion years

• 3.9 billion years

• 4.6 million years

• 4.6 billion years

When did the first land plants appear?

• 420 million years ago

• 248 million years ago

• 65 million years ago

• 4 million years ago

When was the largest mass extinction?

• 420 million years ago

• 248 million years ago

• 65 million years ago

• 4 million years ago

When did early hominids appear?

• 420 million years ago

• 248 million years ago

• 65 million years ago

• 4 million years ago

What does trilobite mean?

• tiny bites

• trial size organisms

• Three bites

• three lobes

In ancient seas 245 million years ago, what was one of the fiercest predators?

• trilobites

• eurypterids

• nautilus

• Archaeopteryx

The Law of Superposition identifies the (relative or absolute) age of organisms.

• relative

• absolute

Radiometric dating gives (relative or absolute) dates

• relative

• absolute

What Eon did the first single-celled organism appear?

• Pre-Archean

• Archean

• Proterozoic

• Phanerozoic