Time G 10

In dendrochronology, scientists -

• examine ice cores for climate information.

• count tree rings to determine ages.

• reconstruct fossils of dinosaurs.

• compare relative times to absolute times.

What evidence supports the conclusion that Scotland, Greenland, and North America were joined in the past?

• All three have the same rocks, the same rock layers, and the same fossils.

• All three have similar climates.

• All three plates collided together at some point in the past.

Given a rock with obvious layers, and assuming they haven't faulted or folded, what can you conclude?

• You would need to use radiometric techniques to find their relative ages.

• The rocks are all the same age since they are all close together.

• The upper layer is younger than the lower layer.

• The bottom layer is younger than the upper layer.

Before paleontologists use an element in radiometric dating, they must know its _______.

• stratigraphy

• relative age

• absolute age

• half-life

The Principle of Uniformitarianism states that -

• geologic processes on Earth were the same in the past as they are now.

• geologic processes on Earth were faster in the past.

• geologic processes are constantly changing, so they can't be used to determine ages.

• Earth appeared at some point in the past, shaped as it is today.

____ dating places an absolute age on an object.

• Radiometric

• Correlative

• Superposition

• Relative