Unit 7 (Part 1)

is a medium sized star and the only star in our solar system.

• year

• month

• day

• Sun

is a terrestrial planet made of rock and water

• rotation

• Earth

• axis

• revolution

is a natural satellite of Earth

• southern hemisphere

• collision ring theory

• moon

• tilt

is the accepted belief of how the moon formed. When a Mars sized asteroid struck Earth forming a ring of debris around Earth which eventually pulled together by the force of gravity to create the Moon.

• collision ring theory

• month

• day

• southern hemisphere

The spinning of Earth on its axis

• rotation

• moon

• revolution

• Sun

the time required for Earth to rotate once on its axis

• revolution

• year

• day

• northern hemisphere

The movement of one object around a central object. (One revolution equals a year)

• northern hemisphere

• revolution

• Earth

• year

The Earth revolves one time around the Sun every 365.25 days which is equal to a

• leap year

• year

• Fall & Spring

• axis

To make up for the .25 days every four years an extra day (February 29th) is added to the calendar and is called a

• Summer

• Winter

• Leap Year

• February

roughly the amount of time required for the moon to orbit the earth once

• week

• 2 weeks

• month

• leap year