Sedimentary Rocks

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

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

• 1
• 2
• 3
• 4

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 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

The picture shows a close-up view of fossils found with the cliff wall.
This cliff is most likely composed of?

• igneous rock
• molten rock
• metamorphic rock
• sedimentary rock

Which can most likely be concluded about the top layer of rock seen in an undisturbed cliff wall?

• The top layer is older than layers located farther down the cliff.
• The top  layer is younger than layers located farther down the cliff.
• The top layer contains more fossils than layers located farther down the cliff.
• The top layer contains fewer fossils than layers located farther down the cliff.

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

Which statement best describes the Law of Superposition?

• Each sedimentary layer of rock represents 1000 years of Earth's age, much like the rings of a tree.
• In undisturbed layers of sedimentary rock, the upper rock layers are older than the lower rock layers
• In undisturbed layers of sedimentary rock, the lowest layers contain the older rocks
• Rocks that form near volcanoes are older than surrounding rock.

Which statement is true about undisturbed layers of rocks on the side of a mountain?

• The rock layers closest to ground level have more fossils than in the top layers
• The layers of rocks closest to ground level are older than the layers at the top.
• The layers of rocks that are the darkest in color are older than those that are lighter

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