Front

What is the earliest time span in Earth's history?

Back

The Precambrian.

Front

What type of fossil is a thin layer of an element left behind as a print?

Back

Carbon Film.

Front

According to the Law of Inclusions, which is older: the rock surrounding an inclusion or the inclusion itself?

Back

The inclusion.

Front

What do scientists use radioactive decay to measure?

Back

Absolute time.

Front

What does the fossil record provide evidence for?

Back

The history of life on Earth.

Front

What is a fossil?

Back

A preserved remains or trace of ancient life.

Front

What are trace fossils?

Back

Fossils that record the activity of organisms, such as footprints or burrows.

Front

What is a mold fossil?

Back

A fossil formed when an organism leaves an impression in sediment.

Front

What is a cast fossil?

Back

A fossil that forms when a mold is filled with minerals or sediment.

Front

What is the significance of the fossil record in understanding evolution?

Back

It shows changes in species over time and supports the theory of evolution.