Earth History Test

What rock layer is the youngest layer?

• a

• x

• y

• L

Which rock layer is the oldest?

• a

• x

• y

• L

What created the feature at M?

• a river valley

• an unconformity

• igneous intrusion

• a fault line

What is the feature labeled N?

• a river valley

• an unconformity

• igneous intrusion

• a fault line

What 2 rocks could be used for radiometric dating? (2 igneous rocks)

• x and y

• a and x

• i and g

• L and y

Which of the layers labeled in the diagram are the youngest?

• 1

• 2

• 3

• 4

Which of the events, labeled, happened most recently?

• folding at a

• intrusion at b

• faulting at c

• unconformity at d

Which statement correctly describes the relatives ages of rocks a and c?

• a is younger than c, because a is a lower rock layer

• a is younger than c, because the intrusion of a went through part of rock layer c

• a is older than c, because a has older index fossils

• a is older than c, because the intrusion of a cuts across rock layer c

The diagram represents a cross section of rock layers. Along which line is a former interface between erosion and deposition? (An unconformity)

• a

• b

• c

• d

Unless a series of sedimentary rock layers have been overturned, the bottom rock layer is usually the oldest. What principle is this?

• original horizontality

• superposition

• cross cutting

• radioactive decay