Fossils and relative dating notes

What are fossils?

Fossils are remains or traces of ancient living things. They include bones, shells, and footprints.

How are fossils formed?

Fossils form when organisms are buried quickly by sediment. Over time, minerals replace organic material.

True or false: All fossils are bones.

False, because fossils can also be shells, leaves, and footprints.

What is relative dating?

Relative dating is a method to determine the age of rocks and fossils by comparing them to others.

Difference between relative dating and absolute dating.

Relative dating places fossils in a sequence, while absolute dating provides a specific age.

What is the Law of Superposition?

The Law of Superposition states that in undisturbed layers, older rocks are at the bottom.

Fill in the blank: Fossils found in the same layer are _____.

similar in age.

What can fossils tell us?

Fossils provide clues about past environments, climate, and the evolution of species.

True or false: Fossils can be found in igneous rocks.

False, because fossils are usually found in sedimentary rocks.

What is an index fossil?

Index fossils are species that were widespread but existed for a short time. They help date rock layers.

How do paleontologists study fossils?

Paleontologists excavate fossils, analyze them, and compare them to understand past life.

What is a trace fossil?

Trace fossils are signs of activity, like footprints or burrows, rather than actual remains.

True or false: Fossils can tell us about extinct species.

True, because fossils provide evidence of species that no longer exist.

What is a fossil record?

The fossil record is a historical sequence of life on Earth preserved in rocks.

Fill in the blank: ____ can change the position of rock layers.

Tectonic forces.

Difference between a mold and a cast.

A mold is an imprint of an organism, while a cast is a copy made from the mold.

What is biostratigraphy?

Biostratigraphy uses fossil distribution to date and correlate rock layers.