Relative and Absolute Dating Flashcard

Front

What is relative dating?

Back

Relative dating is a method used to determine the age of rocks and fossils in relation to one another, without determining their exact age.

Front

What is absolute dating?

Back

Absolute dating is a method used to determine the exact age of a rock or fossil, often using techniques like radiometric dating.

Front

What does the law of superposition state?

Back

The law of superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.

Front

What are index fossils?

Back

Index fossils are fossils of organisms that were widespread but only existed for a short period of time, making them useful for dating rock layers.

Front

How can fossils be used to determine the relative ages of rock layers?

Back

Fossils can indicate the relative ages of rock layers based on the types of organisms present and their known time periods.

Front

What is a geologic column?

Back

A geologic column is a representation of the layers of rock in a specific area, arranged in order of their relative ages.

Front

What is the significance of the principle of unconformity?

Back

The principle of unconformity indicates a gap in the geological record, where rock layers are missing due to erosion or non-deposition.

Front

What is a fault in geology?

Back

A fault is a fracture in the Earth's crust along which movement has occurred, often causing displacement of rock layers.

Front

What is an intrusion in geology?

Back

An intrusion is a body of igneous rock that has formed from magma that has cooled and solidified beneath the Earth's surface.

Front

What is the difference between a fault and an intrusion?

Back

A fault is a break in the Earth's crust where movement has occurred, while an intrusion is a body of rock formed from magma that has pushed into existing rock.