In this lesson, students will discover how soil is formed, be able to describe the differences in soils in terms of texture, mineral content, and where the soil was formed, and identify and describe the parts of a soil profile.
Precambrian continents formed and underwent plate tectonic processes. There were a few supercontinents culminating in the Precambrian with Rodinia.
Human evolution is not a straight line, but has twists, turns and ends. As more fossils are found our ancestors become better understood.