GTS Assessment

Front

What is the longest geological era?

Back

Precambrian

Front

After 22,800 years, what percentage of the original carbon-14 remains?

Back

6.25%

Front

What percentage of Rubidium-87 remains after 4 half-lives?

Back

6.25%

Front

When did the Mesozoic Era begin?

Back

225 million years ago

Front

What type of fossil provides evidence of the activities of ancient organisms?

Back

Trace fossil

Front

Define half-life in the context of radioactive decay.

Back

The time required for half of the radioactive atoms in a sample to decay.

Front

What is the significance of the Precambrian Era in Earth's history?

Back

It represents the time before complex life forms evolved, lasting about 4 billion years.

Front

What are the three main eras of the Phanerozoic Eon?

Back

Paleozoic, Mesozoic, Cenozoic

Front

What is a trace fossil? Provide an example.

Back

A trace fossil is a type of fossil that provides evidence of the activities of ancient organisms, such as footprints.

Front

How do scientists determine the age of fossils?

Back

Through methods like radiometric dating and stratigraphy.