The exact nature of copper's discovery is unknown, and historians do not know who first discovered it. People have used copper for a very long time, and along with gold, it was one of the first metals ever discovered and used by humans. Archaeologists suspect that copper was first discovered in the Middle East around 9000 B.C.Continue Reading
Part of the reason that archaeologists do not know who discovered copper first or where the discovery was made is that copper is such a ubiquitous metal. Copper is found in large reserves throughout the Earth. Modern humans mine copper in the United States, China, Zambia, Zaire, Canada and Peru. Copper is usually mined from the ground as an ore or an impure mineral. It must then be purified and smelted so that it can be used to make objects. Israel, Jordan and Egypt have the oldest copper smelting sites ever discovered. These smelting facilities were likely active around 4500 B.C.
Copper has a number of uses, and ancient people made coins, vases, weapons and jewelry with it. The ancient Egyptians used copper to make water-carrying vessels, and some of them are still functional nearly 5,000 years later. Modern humans use copper as an electrical conductor to make water pipes and for some coins. Copper is the second best conductor for electricity and is very resistant to corrosion.Learn more about Ancient History
The solubility of copper depends on the nature of the copper compound and the solvent used. In its metallic state, copper is soluble in nitric acid and sulphuric acid at a high temperature. Some copper salts are soluble in water.Full Answer >
Located in the Yucatan Peninsula, Chichen Itza was a large city built by the Mayans around 600 A.D. It thrived until about 1221 when the power in the region shifted, and then it was abandoned completely in the 1400s.Full Answer >
Incans had several key natural resources, including potatoes, corn, tuber crops and llamas. Incan societies lived in high mountainous regions characterized by harsh climates and relatively infertile soil. Consequently, there was little diversity in the natural resources available to the native peoples, but hardy crops and animals, such as llamas and alpacas, provided the sustenance they needed to survive. Full Answer >
While the question of whether Sparta was better than Athens is slightly subjective, it's possible to consider Athens inferior because it fell victim to the temptation of becoming an exploitative imperial power. By contrast, Sparta led an alliance commonly seen as relieving other Greek states of the burden of Athenian hegemony.Full Answer >