Fossils are remains or impressions of ancient organisms.

They form in sedimentary rock over millions of years.

Types include bones, shells, footprints, and plant imprints.

Fossils tell us about Earth’s past and extinct species.

Paleontologists study fossils to learn about evolution.

Index fossils help date the rock layers they’re found in.

Fossils are clues to climate, environment, and history.

They form when organisms are buried quickly after death.

Not all remains become fossils—conditions must be right.

Museums display fossils to teach science and history.