History of Planet Earth

Front

What is an index fossil?

Back

An index fossil is a fossil that is used to identify and date the rock layers in which it is found. It is typically found in many different locations but in the same layer of rock.

Front

What does 'sample' mean in scientific terms?

Back

A sample is a small amount of material used for observation or analysis.

Front

What type of rock are most fossils found in?

Back

Most fossils are found in sedimentary rock.

Front

What is a key bed?

Back

A key bed is a layer of rock that scientists use to determine the time period in which it was formed.

Front

Which of the following is NOT a type of fossil: mold, cast, body, or key?

Back

Key is NOT a type of fossil.

Front

What is a fossil?

Back

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

Front

What are sedimentary rocks?

Back

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

Front

What is a mold fossil?

Back

A mold fossil is a type of fossil that forms when an organism leaves an impression in the sediment.

Front

What is a cast fossil?

Back

A cast fossil is created when a mold fossil is filled with minerals or sediments, creating a replica of the original organism.

Front

What does extinction mean?

Back

Extinction is when the last member of a species has died, and that species no longer exists.