Reactions and compounds. New substances are formed by chemical reactions. When elements react together to form compounds their atoms join to other atoms using chemical bonds. For example, iron and sulfur react together to form a compound called iron sulfide.Mixture of iron (grey) and sulfur (yellow) powders.hen elements react, their atoms join with other atoms to form compounds [compound: A compound is a substance formed by the chemical union (involving bond formation) of two or more elements. ] . Chemical bonds form when this happens, which involves atoms transferring or sharing electrons.
The 'red land' was the barren desert that protected Egypt on two sides. These deserts separated ancient Egypt from neighbouring countries and invading armies. They also provided the ancient Egyptians with a source for precious metals and semi-precious stones.
Egypt and Mesopotamia were two civilizations existing during the time period of 2000-1200 BCE.(text, 97) These civilizations were shaped by their environment, involved with trade, and faced changes in government after the 100 year drought; however, they differed in that Egypt was shaped by the Nile, traded goods for goods and changed their outlook on the pharaoh who was ruler of all; whereas, Mesopotamia was shaped by the Tigris and Euphrates, traded money for goods, and had a ruler over rulers.