Worksheets5.1 Unconformities
Total questions: 10
Worksheet time: 5mins
What is the principle of superposition?
The oldest rocks are on the top layer.
The oldest rocks are on the bottom layer.
Rocks are deposited in random order.
Which principle states that rock layers are originally deposited horizontally?
Lateral Continuity
Original Horizontality
Cross-Cutting Relationships
What is an unconformity?
A type of fossil
A gap in the rock record
A rock layer that is older than another
What do index fossils help geologists determine?
The exact age of rocks
The relative ages of rock layers
The types of rocks present
Why are hard parts of organisms more likely to become fossils?
They decay faster.
They do not decay easily.
They are found in water.
What is an unconformity in geology?
A continuous sequence of rock layers
A gap in the geological record
A type of fossil
A mineral deposit
The diagram shows a geologic cross-section from a region.
What are the relative ages of the rocks from oldest to youngest ?
W, V, X, Z, and Y
W, Y, V, X, and Z
W, V, X, Y, and Z
W, V, Y, X, and Z
The diagram shows three sedimentary rock layers and an igneous intrusion.
What is the relative age of igneous intrusion W?
Igneous intrusion W is younger than sedimentary rock layers Z and X, but its relative age to layer Y cannot be determined.
Igneous intrusion W is younger than sedimentary rock layers Y and Z but older than layer X.
Igneous intrusion W is older than sedimentary rock layers Z and X, but its relative age to layer Y cannot be determined.
Igneous intrusion W is older than sedimentary rock layers Y and X but younger than layer Z.
What is the principle of cross-cutting relationships?
Rocks are deposited in horizontal layers.
Older rocks are cut by younger features.
Fossils are found in specific rock layers.
What does the principle of lateral continuity state?
Older rock layers are always found above younger layers.
Rock layers are deposited in vertical sequences.
Rock layers extend horizontally in all directions until they thin out or encounter a barrier.
