Volcano. The lower 48 states have about 40 active volcanoes.
Metal. Some metals are nonmagnetic.
Between Mars And Jupiter. The asteroid belt is comprised of minor planets and asteroids.
Velocity. In physics, velocity is defined as the rate of change of displacement with time.
Mantle. The mantle cavity functions as a respiratory chamber in all molluscs.
Opal. Since water is part of the opal's chemical formula, exposing it to water makes it weak and subject to chipping.
Polaris. Polaris is the brightest star in the constellation Ursa Minor.
Adlerian. A view of the individual as a whole is the basis of the Adlerian approach in psychology.
Peat. Over time, peat will eventually turn into coal.
Sedimentary Rock. Coal is an organic sedimentary rock that forms mainly from plant debris.
Deciduous. Deciduous plants are leafless for some part of the year.
Planet. A planet falls into one of two categories: terrestrial planet or a gas giant.
National Weather Service. The National Weather Service is responsible for issuing severe weather warnings for the United States.
20 Faces. An icosahedron has twenty faces, is one of the Platonic solids, and represents the universe.
Petrified Forest. Theodore Roosevelt created Petrified Forest National Monument on December 8, 1906.
Climate. The Greek word "klima" means inclination and is the basis for the weather term "climate".
Craters. There are approximately 30,000 craters on the moon.
The Gulf Of California. Lying east of Baja California, the Gulf of California was first reported seen by Cortez" men.
Space Shuttle. The Space Shuttle launches from Cape Canaveral in Florida.
Quantum Mechanics. Quantum mechanics, a branch of physics, is also known as quantum physics or quantum theory.