Chapter 10 Clue's to Earth's Past

Front

What is a mold in geology?

Back

A mold is a hollow area in sediment in the shape of an organism or part of an organism.

Front

Which rock layer formed first?

Back

Rock Layer Z.

Front

Are fossils still being formed today?

Back

True.

Front

What do we call the millions of fossils that scientists have collected?

Back

The Fossil Record.

Front

How can scientists determine the ages of fossils?

Back

Scientists can use relative dating, radioactive dating, and the law of superposition.

Front

What is a cast in geology?

Back

A cast is a solid copy of the shape of an organism.

Front

What is a petrified fossil?

Back

A petrified fossil is formed when minerals replace the organic material in an organism.

Front

What is a trace fossil?

Back

A trace fossil is a record of the activity of an organism, such as footprints or burrows.

Front

What is the Geologic Time Scale?

Back

The Geologic Time Scale is a system that relates geological strata to time.

Front

What does relative dating tell us?

Back

Relative dating helps determine the order of past events without giving an exact age.