We live in a layered world
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... We live in a layered world' It is true that we live in a layered world, our earth's surface remain terra incognita to-day, for ease of movement and other technological developments have made possible an almost comprehensive knowledge of the terrain, much of which is now accurately mapped. Not least in importance is the contribution made recently by aerial surveys, which, besides speeding mapping, frequently reveal previously unknown features and are often used in the detection of valuable mineral deposits.
All this vast range of knowledge serves, among other things, to emphasize the great physical diversity of the home of man. The pattern of human activity on the earth's surface is the result of the...