Earth's History Quiz #1

The first living things on Earth appeared approximately how long ago?

• 4.5 billion years ago
• 4.0 milllion years ago
• 3.8 billion years ago
• 400 million years ago

Which of the following were the first organisms that produced oxygen?

• Anaerobic microbes
• Ferns
• Conifers
• Cyanobacteria, also known as Blue Green Algae

Approximately how long ago did Earth form?

• 4 million years
• 4.5 billion years
• 2.8 billion years
• 400 million years

Which was the last life form to appear on Earth?

• Primates
• Flowering Plants
• Monkeys
• Humans
• None of the above

What event resulted in water being in the Earth's oceans?

• Late Heavy Bombardment
• Great Oxygenation Event
• Cyanobacteria
• Asteroids colliding with Earth

What were the earliest life forms on Earth?

• Aerobic Bacteria
• Anaerobic Microbes
• Multicellular Organisms
• Insects

The geologic time scale is divided into four large units known as:

• Epochs
• Eras
• Eons
• Periods

How many eras is the Phanerozoic Eon divided into?

• 4
• 5
• 2
• 3

What does discovering two different fossils in the same rock layer tell you.

• The fossils are the same species.
• The fossils are from different time periods.
• The fossils are both billions of years old.
• The fossils are from the same time period.

How would you describe Earth 4 billion years ago?

• It was covered with a shallow sea
• It had cooled down after being molten rock
• It had blue green algae that produced oxygen
• It had no oxygen