Because nearly all of the crops or livestock raised are used to maintain the farmer and the farmer’s family, leaving little, if any, surplus for sale or trade. Preindustrial agricultural peoples throughout the world have traditionally practiced subsistence farming. Some of these peoples moved from site to site as they exhausted the soil at each location. As urban centres grew, agricultural production became more specialized and commercial farming developed, with farmers producing a sizable surplus of certain crops, which they traded for manufactured goods or sold for cash.
B. Particle larger than 64 mm in size ejected as glowing lava
St. Lawrence River is located on Lake Ontario in Canada
So that Russian citizens could purchase shares in state enterprises. undergoing the process of privatization.
While yes, the earth has changed before, the reason it is changing now is because of greenhouse gases being pushed into the atmosphere by human activity. Also climate change take hundreds of thousands of years by slow process, this is the fastest the climate has ever changed. The last 20 years have had the 19 hottest years in recorded history.
