Velocity. In physics, velocity is defined as the rate of change of displacement with time.
More Science Trivia
Volcanic Ash. Volcanic ash is comprised of pulverized rock and glass.
Venus. The temperature on Venus ranges from -50 to 900 degree F.
10,000 Meters. The hadal zone or trench zone is 20,000 feet deep and below the ocean floor.
Lunar Eclipse. A lunar eclipse may be total, partial or penumbral.
Greenhouse Effect. Venus and Mars also have a "greenhouse effect".
Pluto. Pluto and it's moon Charon are close in size.