Broad completely misses the point that sub-surface demolition makes plugging the well “from the top” unnecessary.
About three inches below the soft snow was a sub-surface crust strong enough to carry the bodily weight.
Both surface and sub-surface storage sometimes hold the water from the streams at times when it might be advantageously used.
Studies were likewise made of cantonment areas, with reference to water supplies and to surface and sub-surface conditions.
In addition, there are indicated the sub-surface contours of one or more of the coal seams which are selected as datum horizons.
The sub-surface structure, even though complex, can be readily read from one of these surface maps.
Those beneath the surface, called "sub-surface deposits" or "mines," in general belong to the government.
The only safe thing appears to be the sub-surface irrigation plan, for which, fortunately, there is plenty of room on our lot.
The sub-surface circulation in the Atlantic may be regarded as consisting of two parts.