Topic 8 Review

During which era was pangea still completely together?

When did the fish first appear?

The majority of Earth's history was spent in which Era?

What is the accepted age of the Earth?

According to relative age dating. Which of these is probably the oldest rock?

Which best explains the law of superposition?

Scientists formed the geologic time scale by studying _________.

Which of these is a description that matches Absolute Age?

Our understanding of Earth's history changes with each newly-discovered fossil or rock.

Is this conformity or unconformity in sedimentary rock layers?

A geologist says that one rock is older than another rock. This is describing the _________ age of the rocks.

What caused the dinosaurs to go extinct? (as far as we can tell)

According to relative age dating. Which of these is probably the youngest rock?

When did the reptiles first appear?

To organize the vast number of years in Earth's history, scientists created the _______.

What is the law that states that younger rock layers are found above older rock layers?

330 million years ago, Pangea formed... this dramatic event plus volcanic activity probably caused the end of what era?

What is the dominant land animal of the Cenozoic Era?

When did the humans first appear?

During __________, the atoms of one element break down to form atoms of another element.

Which is NOT one of the three eras?

The number of years that have passed since a rock formed.

Which of these is the smallest division of time we use for Geologic Time?

When did the bacteria first appear?

Why don't all extinctions create a negative outcome?

Which of these is a fossil?

Earth's geological time scale divides Earth's history into units of time based on what?

Which of the following is one criteria of an index fossil?

If polar bears can ONLY catch food on ice, what happens to the polar bear when the ice melts?

Is this conformity or unconformity in sedimentary rock layers?

Which of the following BEST DESCRIBES the causes of massive extinctions?

Geologists use __________ to determine the absolute ages of rocks.

The preserved remains or traces of living things.

Which of these didn't play a role in Earth's Mass Extinction events?

Which organisms are most likely to survive over a LONG period of time?

Why don't we have many fossils from the Precambrian?

A(n) _________ is a gap in the geologic record.

When did the Trilobites first appear?

If I were looking for Dinosaurs, which Era should I set my time machine for?

In the geological timescale, what is the first and longest unit of Earth's history?

When did reptiles rule the Earth?

The age of a rock compared to the ages of other rocks.

What usually ends a Era?

Which of these is least likely to preserve a whole animal as a fossil?

During which era did flowering plants first begin to live?

What potentially catastrophic event has been occurring regularly since the formation of Earth?

During which era did dinosaurs flourish?

Which is the correct order of Earth's eras from oldest to newest?

The oldest time, before the 3 eras, when there was little to no life, is known as __________.

When did the Cambrian Explosion occur? (this was a biological explosion, not a BOOM explosion)

In which era do we currently exist?

When did Earth's Geological Time Scale begin?

List the order of Geologic time from the Precambrian to today?

These are undisturbed, horizontal, sedimentary rock layers. According to the law superposition, which layer is youngest?

Which of these did not help to create the Geologic Time Scale?

What period is known as the Age of the Trilobite?

When did the dinosours first appear?

If a species does not adapt to its changing environment, what might happen to that species?

According to the Law of Superposition, which of these layers is the oldest?

What Era of the Earth do we live in now?

What is one major reoccurring event that may have participated in multiple mass extinctions?