Unit 3 Review: Geologic Time

Any intrusion or fault that moves through a rock layer is younger than the rock it affects.

How many half-lives of time are represented by point C along the time axis?

Processes that occurred on Earth in the past are the same that are happening today.

In an undisturbed sequence of rocks, the oldest rocks will be on the bottom and the youngest rocks will be on the top.

Scientists estimate the age of the Earth to be about ____ years old.

Using the table below, which isotope would be most helpful in dating bones through to be about 6,000 years old?

What is the independent variable?

The geologic time scale is a record of

Fossils provide clues to

Which statement correctly describes an age relationship in the geologic cross section below?

The amount of time it takes for half of a radioactive substance to decay

The first living thing appeared on Earth about 3.5 billion years ago

formation of atmosphere and oceans

Rock age compared with ages of other rock

A fossil is

Which of the following is used to determine the absolute age of a rock?

According to the graph, what is the total percentage of radioactive element A after 3 half-lives?

Number of years since rock formed

Any fragment of rock that is inside of another rock is older than the surrounding rock.

First dinosaurs went extinct, then humans evolved

Scientists have inferred that Earth’s original atmosphere was formed by the

According to the graph, what happens to the amount of decay product B (daughter isotope) as time increases?

Age of Reptiles

Which graph shows the duration of geologic time for the Precambrian, Paleozoic, Mesozoic and Cenozoic time intervals?

What is the dependent variable?

Molds, casts, coprolites and petrified wood are all examples of

Pangea separates into continents

The Oakland Raiders were formed in 1852

What organism is responsible for the formation of the atmosphere?

Sharks evolved before humans

What principle is being shown below?

Cyanobacteria uses the process of _____ to produce energy and oxygen is given off as a waste product.

Method used to determine absolute age of rocks by determining the amount of radioactive element it contains

Widely distributed, and represented a type of organism that existed briefly (EX: trilobite)

According to the graph, what happens to the amount of radioactive element A (parent isotope) as time increases?

Which sequence correctly shows the age of the lettered rock units, from oldest to youngest?

plants move on land

Age of Fishes

cyanobacteria dominate life

The mass extinction at the end of the Permian Period led to

Which rock layer is youngest?

What are the fossil insects preserved in hardened tree sap called?

What happened first?

After how many half-lives does the radioactive element A equal decay product B?

Dinosaurs became extinct at the end of the

Many scientists hypotesize that the dinosaurs became extinct because

Oakland became a city before Piedmont did

What is being represented in the image below?

Age of Mammals

90% of Earth’s history