What is any method of determining an event is older or younger than other events?

What is any method of measuring the actual age of an event or object in years?

A principle that states that geologic processes that occurred ini the past can still be explained by the current geologic processes is called?

The principle that states that younger rocks lie above older rocks if the layers have not been disturbed is called?

An atom that has the same number of protons but a different number of neutron of the sam element...causing the element to have a different atomic mass is called a(n)?

A fossil is a

What is an unconformity?

What is a fossilized mark that is formed in soft sediment by the movement of an animal?

What is a fossil that is found in the rock layers of ONLY ONE geologic age and is used to establish the age of the rock layer is called a?

An arrangement of rock layers in which the oldest rocks are at the bottom is called?

Ross from the t.v. show Friends was a

Dinosaurs, dodo birds and wooly mammoths are examples of animals that have gone into

What is the process in which radioactive isotope tend to break down into a stable isotope of the same element is called?

What is a method of determining the ages of an object by estimating the ratio of the parent to daughter isotopes?

The study of fossils is called?

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