Relative Age of Rocks

Scientific law that states in horizontal sedimentary rock, the oldest layers are at the bottom

• intrusion

• fault

• index fossil

• superposition

An intrusion is always ___________ than the rock layers around it and beneath it

• younger

• older

A ________________ is a break in Earth's crust

• intrusion

• fault

• extrusion

• igneous rock

The diagram shows a cross section of rocks beside a highway. 
Which rock type is the oldest?

• rock type 1
• rock type 2
• rock type 3
• rock type 4

In the diagram which rock lasyer is probably the oldest?

• layer 1
• layer 2
• layer 5
• layer 6

Which rock layer most likely contains fossils of the most recently evolved organisms

• 1
• 2
• 3
• 4

The diagram shows some of the layers of rocks found in the Grand Canyon. Scientists find these layers of rock useful for studying fossils
What type of rock is shown labeled in these layers?

• extrusive
• igneous
• metamorphic
• sedimentary

Based on the Law of Superposition, what can be concluded about fossils?

• fossils give clues about past climate patterns
• Fossils form from the hard parts of organisms
• The oldest fossils are found in the lowest rock layers
• The most recent fossils were advanced organisms

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

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

_{Which rock layer in the diagram seems to be the oldest?}

• F
• E
• B
• A