CHAPTER IV.. The Work of Ground (underground) Water.

THE WORK OF GROUND (UNDERGROUND) WATER.

Conditions influencing descent of rain-water, 213. Supply of ground-water not altogether dependent on local rainfall, 215. Ground-water surface—water table, 215. Depth to which ground-water sinks, 216. Movement of ground-water, 220. Amount of ground-water, 221. Fate of ground-water, 221.

+The Work of Ground-water+ 222 Chemical Work 222 Quantitative importance of solution, 223. Deposition of mineral matter from solution, 225. Mechanical Work 226

+Results of the Work of Ground-water+ 226 Weathering, 226. Caverns, 227. Creep, slumps, and landslides, 231. Summary 232

+Springs and Flowing Wells+ 234 Mineral matter in solution, 235. Geysers, 236. Artesian wells, 242.