Unit 4 Earth History

The idea states the same processes that occurred in the past operate in the same way as they do in the present.

• Absolute Dating
• Relative Dating
• Catastrophism
• Uniformitarianism

Which of the following terms describes a change according to the principle of uniformitarianism?

• Sudden
• Rare
• Global
• Gradual

Determining whether an object or event is older or younger than other objects or events is called?

• Relative dating
• Super-position
• Geologic column
• Half life

Older rocks are under younger rocks is:

• Super position
• Uniformatiarianism
• Catastrophism
• Geology

What is the time needed for half of a sample of a radioactive substance to undergo radioactive decay?

• Half life
• Isotope
• Radioactive decay
• None of these

What is an arrangement of rock layers in which the oldest rocks are at the bottom?

• Geologic Column
• Relative dating
• Superposition
• Unconformity

What is the trace or remains of an organism that lived long ago?

• Fossil
• Chiefs
• Unconformity
• Patriots

Fossils found on the upper part of a geologic column are _________________ than fossils found on the lower part.

• Younger
• Older
• The same age
• It it impossible to determine

What process involves the comparison of rock layers with others in a sequence to determine its age?

• radiometric dating
• relative dating 
• absolute dating
• carbon 14 dating

A fossil used to date surrounding rock layers is called a(n)

• index fossil
• trace fossil
• mold
• cast