Ea S Bell work Th 12/12

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of a living organism from a past geological age.

Front

What type of rock do fossils most likely occur in?

Back

Fossils most likely occur in sedimentary rock.

Front

What part of an organism's body typically fossilizes?

Back

Teeth and bones typically fossilize.

Front

What is half-life?

Back

Half-life is the length of time required for half of the radioactive atoms in a sample to decay.

Front

How do scientists determine the end of one time period and the beginning of another?

Back

Scientists determine this when a major extinction event results in at least 70% of all species disappearing.

Front

What is daughter material in dating fossils?

Back

Daughter material is the product formed when radioactive atoms decay.

Front

What is the approximate age of a fossil with 70% daughter material?

Back

The approximate age of the fossil is 3000 years old.

Front

What are the three main types of rocks?

Back

The three main types of rocks are igneous, metamorphic, and sedimentary.

Front

What is an example of a major extinction event?

Back

An example of a major extinction event is the extinction of the dinosaurs.

Front

What is the difference between igneous and sedimentary rock?

Back

Igneous rock forms from cooled magma or lava, while sedimentary rock forms from the accumulation of sediment.