The Moon!

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
The Moon’s takes —the same amount of time it takes to revolve once around Earth. Because these two motions take the same amount of time,
the of the Moon .

The of the Moon the light of the .

The of the Moon depends on the relative of the Moon, , and the .

A occurs when the is and the Sun. During a new moon, the of the Moon is and the of the Moon faces .

means that of the half of the Moon can be seen each night

A occurs when of the Moon’s that faces Earth .

the , the are said to be .

means that you can see of the half of the Moon each night.

It takes about for the Moon to complete its cycle of .

Recall that it takes about for the Moon around Earth. The difference in the numbers is due to Earth’s revolution. It takes about for the Sun, Earth, and the Moon to their same relative .

take place when light from reaching the Moon, or when the light from reaching a part of Earth.

Sometimes, during a , the Moon’s falls on Earth. This causes a .

During a , Earth may cast a on the Moon. This
causes a .

An can take place only when the , the , and are perfectly.

A occurs when the moves directly the and casts its over part of .

The darkest portion of the on Earth is called the


When moves directly the and its falls on the , a occurs.

happen only during the phase.


The , states that the formed of years ago from condensing gas and debris thrown off when with a Mars-sized object.