Early Earth History

The principle that states that the processes occurring since Earth formed is known as the principle of

• uniformitariansim

• original horizontality

• superposition

• cross-cutting relationships

What is the longest unit of time?

• Eon

• Era

• Period

• Epoch

What Era are we currently in?

• Paleozoic

• Mesozoic

• Cenozoic

• Triassic

Which Era was dominated by dinosaurs?

• Paleozoic

• Mesozoic

• Cenozoic

• Cambrian

Which segment of time is the smallest?

• Eon

• Era

• Period

• Epoch

Which era began with the early invertebrates, such as trilobites and brachiopods.

• Paleozoic

• Mesozoic

• Cenozoic

What era was the age of fish?

• Precambrian
• Palezoic
• Mesozoic
• Cenozoic

What type of rock do fossils form in?

• Igneous
• Sedimentary
• Metamorphic
• Classic

An event in time when large amounts of animals and plants die off

• geologic time
• precambrian
• period
• mass extinction

What is the Cenozoic Era also known as ?

• Age of Mammals
• Age of Plants
• Age of Cenozoic 
• Age of Birds