Youth refers to a young person, i.e. a person between childhood and adult age. On the other hand, teenager refers to someone who is specifically between the ages of 13 and 19.

Youth is a younger human being, typically defined as between the teen years and early 20s. An adult is a human being that has achieved puberty and to some extent maturity. Legally an adult is anyone over the...

Geology is more concerned with the processes that came into play to create the earth, as well as what it is composed of, mainly the various types of rocks. Geography deals with everything else. Technically, it...

Gas is a state of matter. Vapor is a state of equilibrium between a gas and a liquid, which can easily be converted to a liquid by applying pressure and without changing the temperature.

There are four main types of telescopes. These include The Refracting Telescope, The Reflecting Telescope, Radio Telescopes, and X-ray and Gamma-ray telescopes. Each one works in a different manner.