Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
|
Relative Age |
The age of a rock compared to the ages of rock layers,
|
|
|
Absolute Age
|
The age of a rock given as the number of years since the rock formed. |
|
|
Law of superposition
|
The geologic principal that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it. |
|
|
Extrusion
|
An igneous rock layer formed when lava flows onto Earth's surface and hardens.
|
|
|
Intrusion
|
An igneous rock layer formed when magma hardens beneath Earth's surface.
|
|
|
Fault
|
A break or crack in the Earth's lithosphere along which the rocks move.
|
|
|
Unconformity
|
A place where an old eroded rock surface is in contact with a newer rock layer.
|
|
|
Index Fossil
|
fossils of widely distributed organisms that lived during only one short period.
|
