Earth History Test

Front

In which kind of rock do we usually find a fossil?

Back

Sedimentary rock is where fossils are typically found.

Front

What is the Half life of this isotope?

Back

The half-life of this isotope is 10 seconds.

Front

What does the Geologic Time Scale record?

Back

The Geologic Time Scale is a record of the known history of rocks and fossils.

Front

What is the term for the length of time required for half of the radioactive atoms in a sample to decay?

Back

The term is half-life.

Front

What type of fossil provides evidence of the activities of ancient organisms, such as footprints?

Back

This type of fossil is called a trace fossil.

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of ancient organisms.

Front

What are sedimentary rocks?

Back

Sedimentary rocks are formed by the accumulation of sediments, often containing fossils.

Front

What is radioactive decay?

Back

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation.

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.

Front

What is the significance of the Geologic Time Scale?

Back

The Geologic Time Scale helps scientists understand the timing and relationships of events in Earth's history.