As the couple climbed to higher elevations, more caution was necessary as icy patches became more frequent.
The general conclusion would appear to be that, while as seen from the earth's surface much of the light from the sky is due to comparatively gross suspended matter, yet an appreciable proportion is attributable to the molecules of air themselves, and that at high elevations where the blue is purer, the latter part may become predominant.
Americanus) the ridges are simple transverse wedge-shaped elevations, with straight or concave edges.
This elevated region is known as the plateau of Matto Grosso, and its elevations so far as known rarely exceed 3000 ft.
The lowland elevations in this part of the state range from 300 to 400 ft.
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