Some students also start taking a foreign language or advanced math and science classes in middle school. Typically schools will offer Spanish and French; and, often German; and, sometimes Latin; Chinese, Japanese, and/or Greek. In addition to Pre-Algebra and other high school mathematics prep courses, Algebra I and Geometry are both commonly taught. Schools also offer Earth Science, Life Science, or Physical Science classes. Physical education classes (also called "PE", "phys ed", Kinesiology, or "gym") are usually mandatory for various periods. For social studies, some schools offer U.S. History, Geography, and World History classes.