Earth forms can be designed to protect buildings from wind and other harsh weather conditions, or they can be formed to channel air into the building. Geothermal energy is provided by subterranean movement of water in contact with the intense heat produced at the Earth's core. This source can provide steam and hot water. Geopressure can be found deep in the ground. This pressure can move turbines to produce mechanical or electrical energy.
Purification of water occurs as it percolates down through the soil where impurities are deposited.
This process is aided by aerobic and anaerobic bacteria in the soil that over time reduce most waste to a harmless state. Building Materials can be obtained from the Earth at the site without or with less of the expense of manufacturing and transporting them. Stabilized earth, adobe blocks, rammed earth, earth floors, sod roofs, and mud surfacing are examples of on site, low cost building material potentials. It is important to understand the value of plant life on Earth. This relationship of sun and plants that created the biosphere around the Earth allows man and animals to survive.