An Introduction to Physical Geography

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Page 110 - Sea and all were lost in a sandstorm, which lasted the whole day. Imagine all distant objects entirely lost to view, — the sheets of sand fleeting along the surface of the desert like streams of water ; the whole air filled, though invisibly, with a tempest of sand, driving in your face like sleet.
Page 219 - Air is a mixture of two gases, — oxygen and nitrogen, — in the proportion of one part of the former to four of the latter. Oxygen is the active gas, the feeding and warming gas, the life-giving principle of nature. It has been well named "the great supporter of animal life.
Page 20 - In moving round the sun, the axis of the earth is not perpendicular to the plane of its orbit.
Page 361 - is a kind of sylvan Venice. Into the depths of the shaggy woodland for many miles on either side the great bay the salt tide ebbs and flows. One can go surprisingly far inland on seafaring craft, while with a boat there are but few plantations on the old York peninsula to which one cannot approach very near. In the absence of good roads this ubiquity of navigable water was a great convenience, but doubtless the very convenience of it may have delayed the arduous work of breaking good land-routes...
Page v - Thus approached, physical geography may well serve to introduce young students to the spirit and method of science. The aim of this volume as set forth will explain the omlaList Price to price, schools. slon of a few of the mure clliiicult conceptions of land physiography which appear In some school textn.
Page 223 - ... moisture. The amount it can receive depends on the temperature ; warm air absorbing more, and cold air less. At 75 the vapor is sometimes so dense that in a cubic yard of atmosphere there is a cubic inch of water. At 50 half that quantity must be deposited. When the air at any temperature contains all the vapor it can hold, it is said to be saturated; any fall of temperature will then cause a part of the vapor to be condensed.
Page 72 - If the student will search in a boulder heap, he will probably find some piece of sandstone which is so soft that it can be cut with a knife, or will even crumble in the hand.
Page 4 - The earth without and within.—No one knows much about the inside of our globe. Yet most of its bulk and weight are far within the surface, and geography, which looks at the earth as a whole, must take notice of it.
Page 290 - ... separated by wide spaces of blue. About a dozen waterspouts were seen in all, the ship passing right through one of them and thus enabling me to estimate its diameter by direct comparison with the known beam of the Servia. The swirls of spray rose from the sea in a cup-like shape, and revolving rapidly in a direction opposite to that of the hands of a watch. It was only after such a swirl had become well denned that the lower surface of the cumulus cloud above it began to descend as if to meet...

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