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Vibrations that travel through the air and can be perceived by most human and animal ears.

The vast 3-dimensional region that begins where Earth's atmosphere ends. Outer space has very low density and pressure, and is the closest we have to a perfect vacuum.

Country in Southeast Asia.

A selection (subset) of data from a larger group of data (the population).

Collecting representative data from some members of a population, to help understand the larger population.

A cartilage wall separating the nostrils of the nose.

A group of organisms that can reproduce with one another in nature and produce fertile offspring.

Speed is a measure of the rate of change of the distance traveled by a moving object. (Formula v = d/t - velocity = distance/time).

Country on Europe's Iberian Peninsula.

The gravitationally bound system of the Sun and the objects that orbit it, including planets, moons, dwarf planets, asteroids, meteoroids, and comets. Our planetary system is named the "solar system" because our Sun is named Sol.