Geologic Time

What term describes organisms dying out over a relatively short amount of geological time?

• Evolution

• Uniformitarianism

• Mass Extinction

• Correlation

What is the length of time it takes for one-half of the original parent to decay?

• Radiocarbon Dating

• Half Life

• Evolution

• Eon

In a cross-cutting relationship, what must be older than the layers it is cutting?

• The intrusion

• The sediment

• The fossil

• The rock

How many principles enabled scientists to interpret the relative ages of rock layers and events in Earth's history?

• 5

• 6

• 7

• 8

Which of the following is the correct order of geologic time units from largest to smallest?

• Era, Period, Epoch, Eon

• Eon, Era, Period, Epoch

• Epoch, Period, Era, Eon

• Period, Epoch, Era, Eon

Which era is known for the dominance of mammals following the extinction of the dinosaurs?

• Mesozoic

• Paleozoic

• Cenozoic

• Proterozoic

The principle of cross-cutting relationships states that:

• Younger features cut across older features

• Older features cut across younger features

• All features are the same age

• Features cannot cut across each other

What is absolute age dating primarily based on?

• Relative position of rock layers

• Fossil Content

• Radioactive decay of isotopes

• Geological events

What can fossils tell us about past climates?

• They show the color of ancient plants

• They indicate the temperature and environment

• They reveal the diet of ancient animals

• They display the size of ancient oceans

Paleozoic, Mesozoic & Cenozoic are all

• Epochs
• Eras
• Periods
• Eons