Ea S Bell work Wed 12/11

Front

What is radiometric dating?

Back

A method used to determine the age of rocks and fossils by measuring the decay of radioactive isotopes.

Front

Why is radiometric dating possible?

Back

Because the rates of decay of radioactive isotopes are constant.

Front

Which part of an organism's body typically fossilizes?

Back

Teeth and bones.

Front

What is the term for the disappearance of a species?

Back

Extinction.

Front

What era is known as the age of the mammals?

Back

Cenozoic Era.

Front

What are fossils?

Back

Remains or traces of ancient organisms preserved in rock.

Front

What is sedimentary rock?

Back

Rock formed from the accumulation of sediment, often containing fossils.

Front

What is the significance of the oldest fossils found in layers of rock?

Back

They provide information about the history of life on Earth.

Front

What does extinction mean in terms of species?

Back

When a species no longer exists anywhere on Earth.

Front

What is the difference between evolution and extinction?

Back

Evolution is the process of change in species over time, while extinction is the end of a species.