Geologic TIme Scale

This principle states the oldest rock is at the bottom and the youngest rock is at the top.

List in order from the longest time span to the shortest time span in the geologic time scale.

The first period of the Mesozoic Era was called the

Which of the following is not an element used in radiometric dating?

The way fossils are formed in very dry places is called

The period during which the 1st land plants began to develop was called the

Why is radioactive decay used to determine the absolute age of rocks?

According to the impact hypothesis, dinosaurs became extinct when

Which of these is not a fossil?

What is radioactive decay?

In which eon did life first form on the earth?

The most common Precambrian (Archaen and Proterozoic Eons) fossils are

Which of the following is not a form of radioactive decay?

An igneous intrusion cuts through a layer of sedimentary rock, what geological law applies?

The principle of uniformitarianism states that

What is amber?

What is the Geologic Time Scale?

When did humans first appear?

Giant dinosaurs dominated during the

The boundary between two sedimentary rock layers is called a(n)

What came from the core of the earth and was trapped in the rock when it solidified?

Which of the following is not an eon?

Coal deposits found in Pennsylvania, Ohio, and West Virginia represent fossilized remains of

What do radioactive materials give off?

The longest period of time in the geologic time scale is called

A set of footprints left by a dinosaur would be an example of

If the Cretaceous Period began about 144 Ma or MYA, this means it began

Dinosaurs became extinct at the beginning of the