Earth's Formation Monday

About how long ago did the Earth form?

• 4.6 million years ago

• 4.6 billion years ago

• 46 million years ago

• 46 billion years ago

What process formed the Earth?

• Accretion

• Gravity

• Spinning

• Solar Nebula

What is the most likely explanation for the presence of water on the Earth?

• Asteroids

• Ice

• Comets

A celestial cloud of dust and gas is called...

• A nebula

• An accretion disc

• Supernova

• Bombardment

How old is our Solar System?

• 6,000 years

• 4.6 billion years

• 4.6 million years

Smaller particles collecting together into larger and larger objects is called . . .

• Accretion

• Contraction

• Explosion

• Rotation

The 4 rocky planets closest to the sun are known as the

• Outer planets

• Gas giants

• Terrestrial planets

• Tiny four

The planets of the solar system formed as

• The center of the gas cloud cooled

• Planetesimals flattened into a rotating disk

• Planetesimals collided into one another

• The sun absorbed extra gas and dust from the solar system

The moon probably formed when...

• A piece of the Earth broke off due to it's fast rotation

• A Mars-sized object rammed into the Earth

• Earth captured the moon gravitationally as it attempted to pass by

• The molten bubble of the Earth budded