GTS PT1

What is the largest time unit on the geologic time scale?

• Epoch

• Period

• Era

• Eon

During which era did the first fish evolve?

• Cambrian

• Silurian

• Devonian

• Ordovician

Which eon is divided into Hadean, Archean, and Proterozoic?

• Precambrian Eon

• Proterozoic Eon

• Archean Eon

• Phanerozoic Eon

In which period did the first seed plants appear?

• Mississippian

• Pennsylvanian

• Devonian

• Carboniferous

What is the division of Earth history into blocks of time called?

• Eon

• Era

• Geologic Time

• Geological Time Scale

Which era is often divided into several smaller time spans called periods?

• Mesozoic Era

• Phanerozoic Era

• Paleozoic Era

• Cenozoic Era

During which period did the Appalachians rise?

• Permian

• Carboniferous

• Devonian

• Silurian

What is the atmosphere made up of during the Archean period?

• Oxygen gas

• Methane gas

• Sulfur dioxide

• Carbon dioxide

In which era did the first millipede fossils and sea scorpions (Euripides) found?

• Ordovician

• Cambrian

• Silurian

• Devonian

When did the Phanerozoic Eon start?

• 500 million years ago

• 300 million years ago

• 4.6 billion years ago

• 1 billion years ago