Earth History Unit Review

What is the term used for the original amount of elemental isotopes being investigated during radioactive dating?

• Parent Isoptopes
• Daughter Isotopes
• Son Isoptopes
• Rare Earth Isotopes

Igneous intrusions are always _______ than the rock they cut through.

• Older
• The same age
• Younger

Which term best explains the following:
The boundary where the Earth's crustal plates move - sometimes disrupting rock layers.

• Erosion
• Unconformities
• Faults
• Volcanoes

Which is a process that allows scientists to compare rock layers with others in a sequence to determine their age?

• Absolute Dating
• Relative Dating
• Radiometric Dating

If a sedimentary rock contains an intrusion of igneous rock, which rock is the oldest?

• The igneous rock is the oldest.
• The sedimentary rock is the oldest.
• The rocks are the same age.

Which element is used to study the age of igneous and metamorphic rocks?

• Carbon
• Uranium
• Krypton

_____________ = Exact Age

• Radioactive Dating
• Relative Dating

_______________ = Estimated Age

• Radioactive Dating
• Relative Dating

Law of superposition states: ____.

• The bottom layer has the oldest fossils.
• The top layer is the oldest.
• All rock layers are the same age. 

In order for the law of superposition to apply, all rock layers must remain _________.

• with fault lines.
• fossilized.
• undisturbed.