Geologic History. Geologic Time Scale Chart of Earths history showing events, time units, & ages Era: the four largest subdivisions of the geologic time.
Chapter 4 Views of Earth's Past
1.Igneous 1.Igneous - formed when molten rock cools. 2.Sedimentary 2.Sedimentary – formed by the “cementing together” of small grains of sediment. 3.Metamorphic.
