Geologic Time

In which time period are we currently living?

• Precambrian
• Paleozoic Era
• Mesozoic Era
• Cenozoic Era

Jellyfish are one of the oldest species on Earth. In what time period did they first appear?

• Precambrian Time
• Paleozoic Era
• Mesozoic Era
• Cenozoic Era

In what time period did Pangaea, the super continent, appear?

• Precambrian Time
• Paleozoic Era
• Mesozoic Era
• Cenozoic Era

Dinosaurs, small mammals, and birds are found in this time period.

• Precambrian Time
• Paleozoic Era
• Mesozoic Era
• Cenozoic Era

Which time period is the longest?

• Precambrian Time
• Paleozoic Era
• Mesozoic Era
• Cenozoic Era

What does relative age tell about rock layers or fossils?

• The age of one rock layer or fossil compared to another.
• The exact age of the fossil detrmined by radiometric dating.
• The location of the fossil.
• How the animal died.

What does absolute age tell about a rock layer or fossil?

• The age of one rock layer or fossil compared to another.
• The exact age of a fossil determined by radiometric dating.
• The location of the fossil.
• How the animal died.

Which of the following are characteristics of index fossils?

• Easily recognizable, abundant, wide geographic distribution, live a short time.
• Hard to recognize, rare, found in one area, live a long time.
• Easily recognized, abundant, found in one area, live a short time.
• Hard to recognize, abundant, wide geographic distribution, live a long time.

Which rock layer is the newest?

• A
• B
• C
• D

What evidence do scientists use to determine the age of the Earth?

• Absolute and relative dating of rocks and fossils.
• The depth of the oceans
• Depth of sediment
• Only the half life of radioactive elements.