Chapter 3. Breaking Ground
The ground you walk on is in a constant state of flux. Every day it shifts by microscopic amounts, which over time add up to entire continents sliding against one another. The Earth is filled with marvels we take for granted. It filters and reuses everything and is the home of billions of organisms. It also harbors underground rivers, pockets of air, and rising molten rock. Sometimes we unknowingly live and build on top of these, not knowing if or when the ground may break.
Layers of the Earth
The focus of this chapter is manipulating the Earth's outer surface. Having an idea of what goes on underground is important for ...