Absolute Age and Geological Time

The length of time required for half of the radioactive atoms in a sample to decay is its...

• era
• age
• half-life
• eon

How does absolute age differ from relative age?

• only absolute dating indicates which rock is older than another
• only absolute dating finds the age in years
• only relative dating finds the age in years

Radiometric dating is possible because the rates of decay of radioactive isotopes _____.

• change over time
• change from place to place
• are constant
• vary widely

An element that has broken down and released particles and energy is said to be _______________.

• radioactive
• subatomic

The original element that undergoes radioactive decay is known as the...

• daughter element
• half-life
• parent element
• carbon-14

The element that is the product of radioactive decay is known as the...

• daughter element

• half-life

• parent element

• carbon-14

What is the largest span of geological time?

• Era

• Period

• Epoch

• Eon

What is the "Age of Mammals"

• Precambrian Eon

• Mesozoic Era

• Cenozoic Era

• Ice Age

What was the "Age of Reptiles"

• Ice Age

• Mesozoic Era

• Precambrian Era

• Precambrian Eon

What is the name of the supercontinent that separated in the Mesozoic Era?

• Pangea

• Pangaea

• League of Nations

• United Nations