traces or remains of living things from long ago.
Fossils the actual bodys or body parts
Ice, amber and tar are
Fossils form in
sedimentary rock like sand or mud
The relative age of a rock is
is the age of an event or object in relation to other events or objects.
The process by which all the different kinds of living things have changed over long periods of time is called
A fossil formed when minerals replace all or part of an organism is called a
Which type of fossil can provide clues about the activities of ancient organisms?
law of superposition states that, in horizontal layers of sedimentary rock, each layer is
older than the layer above it and younger than the layer below it
The fossils of organisms that were widely distributed but only lived during a short period of time are called
Fossils of organisms that were common that lived in many areas and that existed only during specific spans of time
Why are index fossils useful to geologists?
They tell the relative age of the rock in which they occur.
Law of Superposition
In horizontal rock layers the oldest layer is at the bottom
is the length of time it takes for half of the atoms in a sample of radioactive element to decay
Radioactive dating enables geologists to determine
the relative ages of rocks
The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called
Triassic, the Jurassic, and the Cretaceous. These divisions of the geologic time scale are called
Precambrian Time, which includes most of Earth's history, began with
Earth forming from a mass of dust and gas.