Rourke's world of science encyclopedia / Clifford, Tim

A science encyclopedia designed for middle school students, examining topics related to mathematics, explaining what mathematics is, and covering numbers, sets, ratios, statistics, algebra, geometry, measurement, and advanced math, with further reading sidebars and illustrations.

A science encyclopedia designed for middle school students, examining topics related to astronomy and space, explaining what astronomy is, and covering the solar system, stars, galaxies, the universe, space exploration, and people who study space, with further reading sidebars and illustrations.

A science encyclopedia designed for middle school students, examining topics related to the Earth, explaining what Earth science is, and covering the parts of the Earth, forces that shape the planet, weather, habitats, the endangered environment, and people who study the Earth, with further reading sidebars and illustrations.