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.
Ancient Egyptians built the Pyramids and the Great Sphinx at Giza, just outside of todayâs Cairo. Photograph by Javarman, Dreamstime Juice shops are common in Cairo, the capital of Egypt. Photograph by Jackmalipan, Dreamstime Most Egyptians are Muslim. Their houses of worship are called mosques.gypt is often divided into two sections: Upper Egypt in the south and Lower Egypt in the north. The sections are named this way because the Nile flows from south to north. The river empties into the Mediterranean Sea. Southern Egypt's landscape contains low mountains and desert.