Answer:
A secondary Source.
Explanation:
The history book is written by a person who heard of the history events. He/She was not Physically there.
<span>The three basic economic systems are Market
Economy, Mixed Economy, and Planned Economy. Basically, an economic system refers
to the different systems of production, allocation of resources, exchanges, and
distribution of goods and services. This happens in almost all societies but differs
in the policies that are being implemented and followed.</span>
Mining sites are the extraction of valuable minerals or other geological materials from the earth usually from an orebody, lode, vein, seam, reef or placer deposits. ... Mining operations usually create a negative environmental impact, both during the mining activity and after the mine has closed.
