(par 2.2.1. 6. ) Soil Characteristics
http://www.vaderstad.com/en/knowhow/soil-basic The building blocks of soil The soil that is cultivated to create a seedbed only consists to half of solid material, while the remainder consists of pores filled with water or air. Of the solid material, clay and organic material have the strongest influence on the soil and determine its tillage properties. Soil consists […]
(par 2.2.1. 6.1) What is rock?
http://www.eschooltoday.com/rocks/what-is-a-rock.html They are very tiny grains of different minerals, compressed together in chemical reaction to form a bigger mass. Rocks make up non-water part of the earth’s crust. A mineral and a rock do not mean the same thing. Minerals are made of individual or a combination of elements. A mineral is composed of the same substance […]
(par 2.2.1. 1.3) Radiation (From Wikipedia, the free encyclopedia)
http://en.wikipedia.org/wiki/Radiation From Wikipedia, the free encyclopedia In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.[1][2] This includes electro-magnetic radiation such as radio waves, visible light, and x-rays, particle radiation such as α, β, and neutron radiation and acoustic radiation such as ultrasound, sound, and seismic waves. Radiation may also refer to the energy, waves, or particles being radiated. The word arises from the phenomenon of waves radiating (i.e., […]