What are the conditions necessary for the formation of sand dunes? Hi, Dunes are formed by interaction with the wind. Wind speeds of 10 to 20 mph,. are necessary for sand to start saltating under the direct pressure of the wind.
Winters are very harsh in Tundra climate. Winter months temperatures are usually between -18 and -50 degrees. Summer temperatures range from 35-50 degrees. High latitudes are the main cause of of the low temperatures. These areas mainly receive indirect sunlight.
The tundra experiences under 10 inches a year in rain, which amounts to an average of under 0.83 inches per month. The low precipitation is caused by the cold temperatures, which reduces humidity t... Read More Â». http://www.answerbag.com/q_view/2403072.