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100
According to the law of superposition, which layer is the youngest?
A
100
Relative dating of rock layers tells us that the deeper we dig, _______.
the younger the rocks get
the harder the rocks get
the older the rocks get
the older the rocks get
100
Explain weathering, erosion, and deposition.
Break it, take it, and place it.
100
Which rock layer in the diagram seems to be the oldest?
A
200
If a dinosaur fossil and a fish fossil are found in the same layer of rock. What can we assume?
The dinosaur and fish were living at the same time.
200
According to the principle of inclusions which is older, the pebbles or the rock formed around them?
The pebbles are older.
200
True or False: The Geologic Time Scale divides Earth's history into equal time periods with exact dates.
False
200
Which is older a fault or the rock layers it cuts through?
The rock layers are older (Cheeseburger has to be made before it can be cut in half).
300
What could cause a layer of rock to be missing from the rock record?
The rock layer could have been eroded away, forming an unconformity.
300
How could a fossil of a trilobite (ancient sea creature) end up on a mountain in Utah?
The mountain was once underwater/the sea floor.
300
How is time on the geologic time scale divided?
Based on Earth's history and significant events (like mass extinctions).
300
Why isn't the geologic time scale split into even sections?
The events in Earth's history that separate the geologic time scale did not occur in intervals. They occurred randomly, not "every million years".