Momentum. Momentum is conserved in all collision systems.

Sea. A sea is partially surrounded by land.

Timebase Corrector. Time base correction is used to reduce or eliminate mechanical errors in analog recordings.

1/6 That Of The Earth. A 220 pound person on Earth would register about 37.5 pounds on a scale on the moon.

Updraft. Downdraft and updraft are the two forces that cause air to move.

Coal. Bituminous coal is the most plentiful in the U.S.