Chapter 8.2- Relative Age Of Rocks Flashcards
1
Q
A rock is the number of years that have passed since the rock formed
A
Absolute age
2
Q
Determine the relative ages of sedimentary rock layers
A
Law of superposition
3
Q
Lava that hardens on the surface and forms igneous rock
A
Extrusion
4
Q
Magma cools and hardens into mass of igneous rock
A
Intrusion
5
Q
A break in earth’s crust
A
Fault
6
Q
Help geologists match rock layers
A
Index fossil
7
Q
A gap in the geologic record. It shows where rock layers have been lost due to erosion
A
Unconformity
8
Q
A rock is its age compared to the age of other rocks
A
Relative age
