Bowl-shaped indents or cavities on the surface of a planet that are caused by a collision with another object.

A natural satellite that orbits a planet.

The star at the center of our Solar System and supplies heat and light to Earth, its gravity keeps the system in orbit.

A planet in our solar system that has life on it.

A force that pulls objects toward the center of the Earth.

The time it takes the Earth to make one complete spin on its axis. (24 Hours)

A line, real or imaginary, around which something spins.

An instrument that shows direction and uses a small magnet to show North.

A dark area caused when an object blocks light falling on a surface.

An instrument that measures the time of day using the position of the sun.

Earth faces the Sun and is lighted.

Earth faces away from the sun and is dark.