Chapter 23
Physical and Earth Sciences
In this chapter, we'll cover physical laws; solids, liquids, and gases; chemical reactions; the changing earth; glaciers, erosion, and the ice ages; fossils; and astronomy.
A study of any one of the physical sciences could take several hundred pages, but fortunately the GED® test writers don't delve very deeply into any of the subjects that make up the physical sciences—for the very good reason that they've already decided to ask nearly half of their questions about life sciences. This means that the remaining questions must be spread between three different topics: earth and space science, chemistry, and physics. In this chapter, we're going to show you the physical science topics that come up most on the GED® Science test. Here are the topics we'll cover in this chapter:
Energy and Heat
Physical Laws, Work, and Motion
Waves and Radiation
Solids, Liquids, and Gases