Relative dating

Question 1

The number of years since the rock was formed •maybe difficult to determine a sedimentary rocks

Answer 1

absolute age

Question 2

in horizontal sedimentary rock layers the oldest is at the bottom. Each higher layer is younger than layers below it

Answer 2

laws of superposition

Question 3

igneous rock forms when magma or lava hardens

Answer 3

clues from igneous rock

Question 4

lava that hardens on the Surface; layers below the extrusion are always older than the extrusion

Answer 4

extrusion

Question 5

magma that pushes into bodies of existing rock in hardens; an intrusion is always younger than the rock layers around and beneath it

Answer 5

intrusion

Question 6

A break in earths crust; is always younger than the tock it cuts through

Answer 6

fault

Question 7

A fault or body of rock(such as an intrusion)is younger than any feature of rock that the fault or rock body cuts through

Answer 7

The laws of crosscutting relationships

Question 8

slowly builds layers of sedimentary rock

Answer 8

deposition

Question 9

remove slayers, exposing older rock surfaces

Answer 9

erosion

Question 10

A surface where rock layers meet a much older surface; gap in geological record

Answer 10

unconformity

Question 11

help geologist match rock layers

Answer 11

index fossils

Question 12

widely distributed and Represents a type of organism that existed only briefly; ex. trilobites

Answer 12

index fossils must be………

Question 13

The age of a rock relative to the ages of other rocks

Answer 13

relative age