Relative Age of Rocks ch. 4.2 Quiz 17-18

The age of a rock compared to the ages of other rocks is the rock's

• absolute age
• geologic age
• sedimentary age
• relative age

A formation of igneous rock on Earth's surface is known as 

• a gap
• an intrusion
• a fault
• an extrusion

The number of years that have passed since the rock formed is the rock's

• relative age
• law of superposition
• absolute age
• index fossil

Trilobites are good __________ fossils because they were abundant and widespread geographically.

• cast
• index
• preserved
• mold
  carbonized

A break in Earth's crust is called

• an intrusion
• a fault
• a layer
• an index fossil

Relative age is different from absolute age because

• relative age compares rock with surrounding rock while absolute age is how many years since the rock was formed
• relative aging is more accurate than absolute aging
• absolute age compares rock with surrounding rock while relative age is how many years since the rock was formed.
• Relative age is used to determine rock age and absolute age is used to determine age of fossils

According to the law of superposition, the oldest fossils are found 

• At the top of the rock layers
• Near the bottom of the rock layers
• In the middle of the rock layers
• Somewhat near the surface

The diagram shows the fossils in two different sections of rock found in opposite sides of a canyon. Which layer in rock section one is approximately the same age as layer X in rock section two?

• layer 1
• layer 2
• layer 3
• layer 4

The picture shows four different rock layers in a hillside.
What is the best evidence that one of these layers of rock was formed under an ocean?

• the thickness of the layer
• the type of fossils in the layer
• the number of caves in the layer
• the height above sea level of the layer

Which conclusion correctly describes the youngest rock layer in the diagram?

• Layer W is the youngest because it is the top layer of sedimentary rock and the only layer that contains fossils.
• Layer X is the youngest because it is the middle layer of sedimentary rock.
• Layer Y is the youngest because it is the bottom layer of sedimentary rock.
• Layer Z is the youngest because it was once molten rock that moved through all three layers of sedimentary rock.