Unit 2 Review

How old is the Earth?

• 4 million years old

• 14 million years old

• 4 billion years old

• 14 billion years old

What does Phaneorozoic mean?

• invisible life

• visible life

What geologic era is known for the dinosaurs?

• cenezoic

• mesozoic

• protozoic

What is the anthropocene?

• An era of new life

• An era of ocean life

• An era marked by human activity and impact

What is a strata?

• a layer of rock

• a rock's characteristics?

What does the law of superposition state?

• The oldest rocks are found at the bottom of a strata and the newest rocks at the top

• The oldest rocks are closest to the Earth's surface

How is the geologic timeline different from the historical timeline

• The geologic timeline covers a larger span of time

• The geologic timeline is broken into millions and billions of years

• The historical timeline is broken into decades and hundreds of years

• The geologic timeline is mostly broken down by extinctions

How do scientists know about Earth's 4 billion year history when humans have only witnessed a very small part of it?

• By wishing

• By hoping

• By guessing

• By studying rock strata