The shape of Earth's orbit
Occurs when the Sun reaches its greatest distance north or south of the equator
It occurs when one object gets in between you and another object, blocking your view.
It occurs when the Sun is directly over the equator
All of the moon is visible
None of the moon is visible
The moon has completed 25% of its orbit around Earth
Earth cast a curved shadow on the Moon during an eclipse
We saw that the Moon had several different phases.
The distance from the Earth and the Sun began to vary each year.
Early sailors noticed that approaching ships came into view a little at a time.
The time it takes for the Moon to pass through its complete series of phases from new moon to new moon.
The time it takes for the Earth to complete one revolution around the Sun
The time it takes for the Moon to complete a revolution around the Earth
Smooth, dark regions
Made of solid iron located at the moon's center.
Formed when a crater formed a long time ago and molten material seeped into the crater and cooled.
A bowl shaped depression with a raised rim
Formed only with the impact of a meteroid
Hilly areas of the moon covered with craters
Most Apollo missions landed here.
The Moon is too big
Earth wouldn't have enough energy to capture it due to its size
The Moon and Earth have such similar features that it was unlikely that the Moon was formed somewhere else.
The Moon was too small to be captured.
A theory that a "Mars' sized object hit Earth when it was young.
The theory that the moon was captured by the Earth's gravity and pulled into our orbit.
The theory that the moon formed separately at the same time Earth was.
The radiation is intensified
The surface is more vulnerable; craters form easily.
The land is eroded very easily.
No weather or wind
Erosion cannot take place