The bigger the rotor blades, the more energy they can capture from the wind. The giant blades (typically 70 m or 230 feet in diameter, which is about 30 times the wingspan of an eagle) multiply the wind's force like a wheel and axle, so even a gentle breeze is enough to make the outer edges of the blades turn around.he same thing happens in a wind turbine, only the dynamo generator is driven by the turbine's rotor blades instead of by a bicycle wheel, and the lamp is a light in someone's home dozens of miles away. Read more in our main article about generators.
The fur trade is a worldwide industry dealing in the acquisition and sale of animal fur. Since the establishment of a world fur market in the early modern period, furs of boreal, polar and cold temperate mammalian animals have been the most valued.
The Native American Trade refers to historic trade between Europeans and their North American descendants and the Indigenous people of North America, beginning before the colonial period and continuing through the 19th century, although declining it around 1937. The term Indian Trade describes the people involved in the trade. The products involved varied by region and era. In most of Canada the term is synonymous with the fur trade, since fur for making beaver hats was by far the most valuable