A spring is an area on the surface of the Earth where the water table intersects the surface and water flows out of the ground, while a well is human-made hole that is dug or drilled deep enough to intersect the water table.
举一反三
- Where is the water table at the surface, and where is the water table above the surface? A: in streams and hill tops, respectively B: in hill tops and swamps, respectively C: in lakes and streams, respectively D: in swamps and lakes, respectively
- Which one is not the common source of injection water: A: surface water B: ground water C: distilled water D: oil polluted water
- The waterplane area is described as the intersection of the surface of the water in which a vessel floats and the（）.
- ____ any area receives more water than the ground can absorb, the excess water flows to the lowest level, carrying loose material.
- ___from space, our earth ,with water covering over 70% of its surface, appears as a “blue planet”