Coal was created through the decomposition of ancient trees. Most of the coal was was formed 300 million years ago. At the time the earth was covered by swamps. When the ancient plants and trees died, their remains sank to the bottom of the those areas, making layers and layers of plant material and eventually forming a soggy, thick material called PEAT. Over time other materials covered the PEAT and due to pressure the PEAT turned to coal.
Hi here you go
1. mathematics
2. trade
3. astronomy
4.a form of written communication with pictures
5.the invention of the wheel
6.the concept of time.
Answer:
Option: Enslaved workers
Explanation:
Enslaved workers were an essential part of the economy of the Spanish colonies. The purpose was to enslaved workers (Native Americans) and used them as a labour source. Encomienda is a method of labour system introduced by Spanish in America during the colonizing. Native Americans were captured and put into works in plantations (sugar) and mines. Many of them died from beatings, disease, and hunger. The Spaniard allowed them to settle in the colonies where they put in work and converted into Christianity.
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