Glacial till is the simply the unsorted sediment and rock fragments carried by a glacier. Till can contain everything from clay-size material all the way to […]
Ptolemy included epicycles in his orbits. Ptolomy’s model of the solar system was geocentric where moon planets and stars all orbit in perfectly circular orbits. The […]
Granite is a felsic intrusive igneous rock consisting primarily of quartz potassium feldspar (e.g. orthoclase or microcline) or plagioclase feldspar (albite or labradorite) mica (e.g. muscovite […]