New geographies . Fig. 11. — a stump of a tree decaying, or rotting. the side of the walk, or in a flower-pot, was once a part of hard rock. Soil has been made in severalways, which you may learn aboutHow soil is later ; but most of itmade from rock ijas been formed bythe decay of rock. You know thatthe stumps of trees and the boardsin sidewalks, after a long time,become so soft that they fall to you have called it rotting, butthat means the same as decaying. Thepicture (Fig. 11) shows such a stump. Other things, even harder than wood,decay in much the same way, although. Fig. 1
New geographies . Fig. 11. — a stump of a tree decaying, or rotting. the side of the walk, or in a flower-pot, was once a part of hard rock. Soil has been made in severalways, which you may learn aboutHow soil is later ; but most of itmade from rock ijas been formed bythe decay of rock. You know thatthe stumps of trees and the boardsin sidewalks, after a long time,become so soft that they fall to you have called it rotting, butthat means the same as decaying. Thepicture (Fig. 11) shows such a stump. Other things, even harder than wood,decay in much the same way, although. Fig. 12. —a rock clife showing the cracks that extend throughthe rock; also, at the base of the cliff, a large pile of rock frag-ments that have been loosened by frost, and have fallen downthe steep slope. and sometimes the stones have fallen topieces. The decay of rock may also beseen in old stone buildings, bowlders, androck cliffs. Have you ever noticed this ?There are several causes for this rocks have cracks in them (Pig. 12). LAND, WATJEE, AND AIR 13 Usually some of these cracks are solarge that they can be plainly seen; but What causes ^^^^^ ^^ ^^^7 Others sothe decay of small that they cannot be^°^^ seen without a magnifying glass. When it rains, the water stealsinto the cracks, and by eating into and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeography, bookyear19
