Efficiency of coal-fired power plants can be nearly doubled by ________
A) using coal with higher sulfur content
B) switching to oil
C) adding wood chips to the coal
D) using household wastes along with the coal
E) cogeneration
E
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A cone of ________ is formed in saltwater as it intrudes fresh groundwater near a pumping well
Fill in the blank(s) with correct word
Coal would not be considered a renewable source of biomass energy because ________
A) it was not formed from living organisms B) it does not contain organic material C) the organisms that formed the coal lived millions of years ago D) it releases carbon dioxide when burned
Which is not a clue indicating that hornfels forms under conditions of high temperature but not high pressure?
A) chemical composition B) lack of foliation C) cleavage planes D) grain size
Plant roots extract water from
A) streams. B) below the water table. C) the saturated zone. D) the unsaturated zone.