Unit 4 Review

Determining the actual age of an event or object in years is called:

The divide of Earth's history into intervals of time defined by major events or changes is:

The idea that Earth has changed because of major and rapid events

In which epoch do we currently live?

An ordered arrangment of rock layers that is based on the relative ages of rocks is called a:

The time needed for half of a sample of a radioactive substance to undergo radioactive decay:

Cenozoic means _________

When was the formation of Earth?

What major event happened about 65 MYA?

The trace or remains of an organism that lived long ago are called:

What happened at the end of the Paleozoic Era?

When did the dinosaurs die off?

The breakdown of a radioactive isotope into a stable isotope is called:

The ______ of an area describes the weather conditions in the area over a long period of time.

A fossilized structure formed in sedimentary rock by animal activity on or in soft sediment is:

Which is not an Era of time on the scale?

How do sedimentary rocks usually form?

Which is NOT a type of fossil?

What took place in the Paleozoic Era?

Which is not a trace fossil?

Younger rocks lie above older rocks if the layers have not yet been disturbed is the law of:

Using the percentage of parent isotope relative to daughter isotope to determine absolute age:

Scientists can drill down into icecaps to collect a long cylinder of ice called a/an _________.

Which is the period that we currently live in?

Geologic processes that happened in the past can be explained by current geologic processes is:

Eras are _____ than periods.

The scientific study of the origin, history, and structure of Earth and how it is shaped is:

When rock layers are eroded or when sediment is not deposited for a long time is called:

what is a geologic column?

Determining whether an object or event is older or younger than other objects or events is: