Hardened tree sap is called ___________________.

Fossilized dinosaur poop is called ________________________.

Which rock layer is always the oldest?

The study of fossils is called_______________________

What is the type of Fossil Dating that uses rock layers?

Fossils are most commonly found in ____________________________.

Fossils can be preserved in

How many grams are left of a 20 gram sample of a radioactive isotope after 2 half lives?

The half life of Carbon-14 is 5600 years. How much would be left of a 50 gram sample after 11,200 years?

The half life of Carbon-14 is 5600 years. How much would be left of a 100 gram sample after 5600 years?

The geologic time scale is subdivided into

The earliest multicelled organisms were

Which of the following was found in Earth's first atmosphere?

What change is Earth's atmosphere allowed organisms to live on land?

A break in Earth's crust is called

A solid copy of the shape of an organism is

A hollow area in sediment in the shape of an organism or part of an organism is

Which of the following substances is not able to preserve entire organisms?

What type of fossils provide evidence of the activities of ancient organisms?

According to sceintists, both Earth and the moon are

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