Formation of the Earth

How old is planet Earth?

• 10 thousand years
• 4.6 billion years
• 1.5 million years
• 5 hundred years

What is unique about planet Earth compared to other planets in our solar system?

• It is the only planet with mountains
• It is the only planet with liquid water on the surface
• It is the only planet with weather
• It is the closest planet to the sun

What element is found at the core of the Earth?

• Copper
• Iron
• Aluminum 
• Lead

What is the only solid layer of the earth?

• the inner core
• the outer core
• the mantle 
• the crust

What pulled the small particles floating in space closer and closer together eventually forming our planet?

• wind
• megnets
• gravity
• magic

Early in the Earths life, our planet was...

• very hot and molten 
• a solid ball of rock
• very cold
• covered in water

Molten rock eventually solidified on the surface because....

• the Earth moved farther from the sun
• the sub-freezing temperature of outer space
• because the water on the surface cooled the planet
• none of this happened... 

How did water get on our planet?

• It was always there
• It came droplet by droplet from meteorites smashing into the planet
• water floating in space rained down on the planet
• we don't have water on our planet.

What key molecule was the start of life on this planet? 

• water
• amino acids
• nucleotides
• DNA

The larger an object is the more_________ it has

• density
• gravity
• weight
• heat