is a terrestrial planet made of rock and water

is a natural satellite of Earth

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.

The spinning of Earth on its axis

the time required for Earth to rotate once on its axis

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

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

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

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

Point where earth is farthest from the sun

is the position of Earth when it is closest to the Sun

is an imaginary line that runs through the middle of an object around which that object rotates.

causes one hemisphere of Earth to be tilted towards the Sun and the other to be tilted away from the Sun affecting the amount of solar energy Earth receives

is the hemisphere located directly above the equator

is the hemisphere located directly below the equator

are a division of the year marked by changes in weather, ecology, and amount of daylight.

is when one hemisphere is tilted towards the Sun.

Is when one hemisphere is tilted away from the Sun

is when both hemispheres are neither tilted towards or away from the Sun.

s one of the two times of the year when the amount of daylight and nighttime hours are just about of equal length