Sun-Earth-Moon System

The Earth's _?_ is an imaginary line that goes from the North Pole to the South Pole.

• equator
• axis
• prime meridian
• equinox

The Earth's tilt is _?_degrees.

• 0
• 90
• 23.5
• 41

The spinning of an object on its axis is called _?_.

• orbit
• rotation
• revolution
• tide

If the Earth rotated slower, how would that affect the length of the day?

• longer day
• shorter day
• same time,  24 hours

What are the reasons for the seasons?

• Earth's tilt and rotation.
• Earth's rotation and revolution.
• Earth's tilt and revolution.
• Earth's tilt and resolution

What would happen if the Earth's axis was tilted at a greater angle than it is now? 

• Days would be more than 24 hours.
• Days would be less than 24 hours.
• Hotter summers, colder winters
• More tilt would not make a difference.

When the Northern Hemisphere of Earth is leaning away from the Sun, What season is the Southern Hemisphere experiencing?

• Summer
• Winter
• Spring
• Fall

When the Northern Hemisphere is pointing towards the sun, what season is the Southern Hemisphere?

• Winter
• Spring
• Fall
• Summer

Which diagram(s) BEST represent(s) the position of the Moon during a New moon?

• A
• B
• C
• A and C

What causes the phases of the Moon to change over the course of a month?

• The moon's orbit (revolution)
• The moon's spin (rotation)
• The earth's orbit (revolution)
• The earth's spin (rotation)