Glaciers by Robert Sharp Condon Lectures Oregon State System of Higher Education soft cover in used condition "Glaciers are one of the unusual, intriguing elements of our natural environment. Their influence on the world is much greater than one might expect considering that they currently cover only 10 percent of the land and contain 3 per cent or less of the earth's water. No so long ago they covered nearly 30 percent of the land and held an estimated 8 per cent of the water... Glaciers are sensitive and dynamic. They move, and they respond in many different and subtle ways to changes in the environment. They carefully and conscientiously record the effects of various meteorological elements. In some instances they are better at this than man with all his sophisticated instruments. " #vintage #books #paperback #gift #history