Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 169
Fig. 116. ThesBv layers frequently assume concave shapes, so as to resemblecups placed one within another. Pig. 117 represents a verticalsection exposing a few of the surface-layers of the earths crust:a is a stratum of loose sand or gravel; 6, a clay-bed; c, a stratum … &^^-^s\\NV,\x.\\s , ,\S\S^ Pig. 117. of slate; d, a stratum of limestone; the whole resting on a bed ofgranite e. If you hollow out a lump of clay, and pour water intothe eavitx, you will find that the water will percolate through theclay very slowly. Water that falls in rain passes readily…
Physics
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