Nature uncovers the inner secrets of nature in two ways: one by the force of bodies operating outside it; the other by the very movements of its innards. The external actions are strong winds, rains, river currents, sea waves, ice, forest fires, floods; there is only one internal force-earthquake.

In general, the bigger a mountain the older it is. The biggest mountains were built before any others, because when they were built there was incomparably more flammable material within the Earth. Over the many thousands of years that have passed, the quantity of flammable material has doubtless decreased.

Nature uncovers the inner secrets of nature in two ways: one by the force of bodies operating outside it; the other by the very movements of its innards. The external actions are strong winds, rains, river currents, sea waves, ice, forest fires, floods; there is only one internal force-earthquake.

Geometry is the rules of all mental investigation