Earth's Ancient History Quiz

What is the estimated age of some meteorites?

• 3.8 billion years

• 4.5 billion years

• 4.0 billion years

• 5.0 billion years

What is the age of the oldest known igneous rock?

• 3.5 billion years

• 4.0 billion years

• 4.5 billion years

• 5.0 billion years

Approximately how old are the Earth's oceans?

• 3.5 billion years

• 4.0 billion years

• 4.5 billion years

• 5.0 billion years

What is the age of the oldest sedimentary rock?

• 3.5 billion years

• 3.8 billion years

• 4.0 billion years

• 4.5 billion years

What does "anaerobic" mean in the context of early Earth?

• With oxygen

• Without oxygen

• With water

• Without water

Which type of bacteria could only live in anaerobic environments?

• Cyanobacteria

• Aerobic bacteria

• Anaerobic bacteria

• Photosynthetic bacteria

What process began to release oxygen into the Earth's atmosphere?

• Volcanic eruptions

• Photosynthesis by cyanobacteria

• Meteorite impacts

• Formation of oceans

What happened to anaerobic bacteria when oxygen was released by cyanobacteria?

• They thrived

• They were completely shut off

• They evolved into plants

• They became aerobic

Which of the following is NOT a characteristic of the early Earth environment?

• Presence of oxygen

• Anaerobic conditions

• Formation of oceans

• Meteorite impacts

What is the significance of cyanobacteria in Earth's history?

• They caused mass extinctions

• They were the first multicellular organisms

• They released oxygen into the atmosphere

• They formed the first sedimentary rocks