Today, no less than in the past, the tetrahedral form of the earth and the relation of the tetrahedron to the poles and to the equator preserve the conditions that favor rapid evolution.
From Ellsworth Huntington
Although mountains may guide migrations, the plains are the regions where people dwell in greatest numbers.
The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity.
Year by year we are learning that in this restless, strenuous American life of ours vacations are essential.
Fertile soil, level plains, easy passage across the mountains, coal, iron, and other metals imbedded in the rocks, and a stimulating climate, all shower their blessings upon man.
No part of the world can be truly understood without a knowledge of its garment of vegetation, for this determines not only the nature of the animal inhabitants but also the occupations of the majority of human beings.
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