Absolute and Relative Dating Review M/J2

Front

What is Absolute Dating?

Back

A method used to determine the exact age of a rock or fossil in years.

Front

What is Relative Dating?

Back

A technique used to determine the order of events in relation to one another, without determining their exact age.

Front

What is a Half-Life?

Back

The time it takes for half of a radioactive substance to decay into a different substance.

Front

What percentage of the parent isotope remains after 2 Half-Lives?

Back

25%.

Front

What type of rock are fossils most commonly found in?

Back

Sedimentary rock.

Front

What is a Fault?

Back

A fracture in the Earth's crust along which movement has occurred.

Front

What is a Fold?

Back

A bend in rock layers that occurs due to stress in the Earth's crust.

Front

What is the Law of Superposition?

Back

In undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

What is Isostasy?

Back

The equilibrium between the Earth's crust and the underlying mantle, affecting land elevation.

Front

What can be inferred if dinosaur fossils are found below mammal fossils?

Back

Dinosaurs lived on Earth before mammals.