LS 7 Ch 8-1, 8-2 Quiz

At one point all of the modern continents were joined together to form which of these?

Which of the following was NOT found in Earth's very early history?

The "calendar" scientists use to represent the history of Earth.

The earliest period in Earth's history was the

If two half-lives have passed, the percentage of radioactive material remaining in a sample is:

Humans evolved during the ___________ Era

The largest mass extinction known marked the end of which era?

Fish first evolved during which era?

The "Age of the Mammals"

Traces or imprints of the remains of an organism embedded in rock.

Which occurred during the Mesozoic Era?

Earth's history is broken down into large sections of time called

The Paleozoic Era is marked with which of these?

Which of the following is NOT a usual cause of a mass extinction?

Oxygen began to accumulate in Earth's atmosphere due to which of these?

The amount of time it takes for an amount of a sample of radioactive atoms to be reduced by 1/2

Dinosaurs roamed the Earth during the ____ Era

We believe that the continents and the oceans are found on top of which of these?

Birds and mammals first appeared during the ______ Era.

Determining the age of a fossil by comparing it to known ages of rocks/fossils around it.

Determining the age of a fossil by measuring the amount of a radioactive element in it.

A period of time in which a majority of organisms go extinct.

The end of an era is usually marked with a(n)

Trilobites were common during which era?

Early organisms were

The most recent era is the _______ Era

This era is called "The Age of the Reptiles"