Early Earth and Fossil Evidence

A complete list of fossils collected around the planet is called the:

• fossil collection

• fossil record

• compendium of fossils

• fossil encyclopedia

An organism that does not currently live anymore on Earth is said to be:

• lifeless

• extinct

• extemporaneous

• extra dead

Relative dating of a fossil in a rock:

• tells me whether it is younger or older than other fossils

• tells me how many organisms lived in the same area as the fossil

• tells me the exact age of a fossil down to the year it became a fossil

• tells me where the fossil was when it died

Radiometric dating is a way to:

• find the exact age of a rock

• find out whether a fossil was preserved

• find the relative age of a fossil

• find out whether a fossil was petrified

The early atmosphere did NOT have which gas?

• Helium

• Carbon dioxide

• Hydrogen

• Oxygen

True or false. We all evolved from a single cell in Earth's early oceans.

• True

• False

The diagram shows 32 atoms

32 of the Red are the parent isotope

0 of the atoms are daughter isotopes

How many half-lives have occurred?

• 0

• 1

• 2

• 3

The diagram shows 32 atoms.

16 of the Red are parent isotopes

16 of the Green are daughter isotopes

How many half-lives have occurred?

• 0

• 1

• 2

• 3

What is the Half Life of this isotope?

• 3 days

• 5 days

• 8 days

• 10 days

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years. 
How many grams are left after 1 half life? 

• 100 grams
• 25 grams
• 2 grams
• 50 grams