Earth's Formation and Early History

Which statement best describes conditions on early Earth?

• hot with volcanic activity and electrical storms
• dry land covered with volcanic dust
• cold oceans
• dark and dusty with abundant water

Scientists believe the Earth was bombarded with meteorites during the early years of its formation about:

• 5.5 billion years ago
• 4.4 billion years ago
• 4.2 billion years ago
• 5.2 billion years ago

This gas was in high concentrations in the early atmosphere, and later condensed to form Earth's oceans. 

• oxygen
• carbon dioxide
• sulfur oxides
• water vapor

This gas was in high concentrations in the developing atmospheres and later dissolved into rainwater, added to the oceans, then settled to the bottom of the ocean. 

• oxygen
• carbon dioxide
• argon
• water vapor

What gas was most prevalent in Earth's early atmosphere?

• carbon dioxide
• oxygen
• water vapor
• sulfur oxides

What gas were we missing in Earth's early atmosphere?

• carbon dioxide
• oxygen
• water vapor
• sulfur oxides

Where did the water for oceans on earth first come from?

• evaporating water vapor
• condensing water vapor
• it has always been there
• it condensed from the sediment

What do we call the center of the Earth?

• Mantle
• Crust
• Apple
• Core

Which is the hottest part of the Earth?

• The core
• The mantle
• The crust
• The Asthenosphere

What is the core made of?

• Molten rock
• Solid rock
• Molten metal
• Solid metal