Absolute Dating/Geologic Timeline

One half life is the time it takes for all radioactive isotopes to decay into stable isotopes.

• True 
• False

We currently are in the Holocene Epoch, of the Quaternary Period, of the Cenozoic Era

• True
• False

The Earth is estimated to be how old?

• 4.6 Million years old
• 6,000 years old
• 4.6 Billion years old
• Who knows

During the Paleozoic Era life exploded in what part of the Earth?

• Jungle
• Ocean
• Desert
• Rocks

Carbon-14 is used to date fossils that came from

• nuclear reactions
• Living organisms
• nuclear waste
• carbon

During the Quaternary Period of the Cenozoic Era what type of climate changes took place on Earth?

• Earth became very hot
• Earth became very dry
• Earth became cold 
• who cares

Potassium-40 has a half live of 1.3 billion years.  How much Potassium will be left in a rock that has gone through three half lifes?

• 50 percent
• 25 percent
• 12.5 percent
• 6.25 percent

what two events killed the dinosaurs?

• volcanos and meteor impact
• global cooling and meteor impact
• Alien invasion and humans
• disease and war