7 limnetic zone definition shallow water zone

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7. Limnetic zone Definition: shallow water zone, sunlight penetrates Sentence: Many photoautotrophs live in the limnetic zone . 8. Profundal zone Definition: below limnetic zone, no sunlight Sentence: Organisms living in the profundal zone typically use chemosynthesis, not photosynthesis. 9. Aquifers Definition: porous spongelike formations of rock/sand/gravel that hold water Sentence: Without man-made reservoirs, humans would probably have to resort to groundwater or aquifers . 10. Consumptive use Definition: water is removed and not returned Sentence: Humans withdrawing water from water reservoirs is considered consumptive use . 11. Nonconsumptive use Definition: water is used but not removed or temporarily removed Sentence: A great nonconsumptive use of water is channeling it to power hydroelectric energy.
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12. Flood and furrow irrigation Definition: fields are flooded with water that may evaporate from standing water Sentence: Flood and furrow irrigation is a very wasteful irrigation method, because a lot of the water ends up evaporating before being absorbed by the roots.
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