INTRODUCING: EARTH

What event led to the formation of Earth's Moon?

• A massive volcanic eruption on Earth.

• A large asteroid impact that broke off a piece of Earth.

• A Mars-sized planet colliding with Earth, ejecting debris that coalesced.

• The capture of a passing celestial body by Earth's gravity.

How did Earth's first oceans form?

• Water was released from the planet's core.

• Comets and asteroids delivered water to the surface.

• The planet cooled enough for atmospheric water vapor to condense into liquid.

• Volcanic activity continuously spewed out water.

What significant change did cyanobacteria bring to Earth's atmosphere?

• They produced methane, leading to a greenhouse effect.

• They consumed all the hydrogen sulfide, making the air breathable.

• They produced oxygen, which lowered carbon dioxide levels and led to an ice age.

• They absorbed carbon dioxide, causing the planet to warm.

What characteristic defined many of the animals that evolved during the Cambrian Explosion?

• Soft, gelatinous bodies

• Hard body parts like shells or spines

• Ability to fly

• Complex internal skeletons

What was the primary cause of Earth's greatest mass extinction event?

• A sudden ice age

• Widespread volcanic eruptions leading to greenhouse gases and global warming

• A large asteroid impact

• A global flood