Journey Through Earth's History

What was Earth's first atmosphere primarily composed of?

• Oxygen and nitrogen

• Carbon dioxide and oxygen

• Helium and hydrogen

• Hydrogen sulfide, methane, and carbon dioxide

What event led to the formation of the Moon?

• A comet passing by Earth

• The collision with Theia

• Volcanic eruptions on Earth

• A supernova explosion

What was the name of the first supercontinent?

• Pannotia

• Vaalbara

• Pangea

• Rodinia

Which organisms were Earth's first photosynthesizers?

• Mosses

• Ferns

• Cyanobacteria

• Algae

During which period did the Cambrian Explosion occur?

• Silurian

• Ordovician

• Precambrian

• Cambrian

What caused the dinosaurs to become extinct?

• A massive volcanic eruption

• An asteroid impact

• A sudden ice age

• A pandemic among dinosaurs

When did the first known humans appear?

• One million years ago

• Ten thousand years ago

• Two hundred fifty years ago

• Around six million years ago

What significant event happened about 250 years ago?

• The discovery of fire

• The founding of the first city

• The invention of the wheel

• The Industrial Revolution

What is the current global population?

• Over six billion people

• Over eight billion people

• Over ten billion people

• Over twelve billion people

What is the major threat to life on Earth today?

• Nuclear war

• Volcanic eruptions

• Climate change

• Asteroid impacts