The science of rocks, concerned with the study of their history, composition, and structure. The observation of thin slices of rocks under a microscope is one of the most important of petrographic technologies.
1.8 billion miles from the Sun, the first of the ice giants, blue Uranus orbits, encircled by faint rings. Unlike every other planet in the solar system, Uranus rotates sideways, like a wheel rolling along its orbit. Uranus is named after the Greek God of the sky, and it is the only planet named directlyRead More
Crystal System refers to each of seven categories of crystals (cubic, tetragonal, orthorhombic, trigonal, hexagonal, monoclinic, and triclinic) classified according to the possible relations of the crystal axes.