Geologic History of Earth Quiz

What process led to the formation of the sun and planets in our solar system?

• Chemical reaction

• Nuclear fusion

• Nuclear fission

• Magnetic attraction

Why is it difficult for scientists to describe the appearance of early Earth?

• Absence of water

• Lack of sunlight

• No atmosphere

• No rocks older than 3.8 billion years

What was the primary composition of Earth's first atmosphere?

• Oxygen and nitrogen

• Carbon dioxide and methane

• Hydrogen and helium

• Nitrogen and argon

Which gas was notably absent from Earth's early atmosphere?

• Carbon dioxide

• Oxygen

• Helium

• Nitrogen

What is the largest unit of geologic time?

• Eon

• Epoch

• Period

• Era

What percentage of Earth's geologic time is made up by the Precambrian?

• 50%

• 10%

• 88%

• 25%

Which era is known for the dominance of dinosaurs?

• Mesozoic

• Paleozoic

• Cenozoic

• Proterozoic

What is the process by which organisms adapt to environmental changes over time?

• Extinction

• Evolution

• Metamorphosis

• Photosynthesis

What is the primary source of evidence for the evolution of life on Earth?

• Fossil record

• Meteorite samples

• Volcanic rocks

• Ocean sediments

What happens to organisms that cannot adapt to environmental changes?

• They become dormant

• They go extinct

• They migrate

• They evolve