Science chap.25 Word Scramble
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Question | Answer |
acid rain | precipitation, as rain, snow, or sleet, containing relatively high concentrations of acid-forming chemicals, as the pollutants from coal smoke, chemical manufacturing, and smelting, that have been released into the atmosphere and combined with water vapor |
conservation | using natural resources in ways that restore them, prevent their waste, and preserve the natural balance of organisms |
contour plowing | grooves are made across slopes along their curves |
erosion | the process by which the surface of the earth is worn away by the action of water, glaciers, winds, waves, etc |
fallow | plowed and left unseeded for a season or more |
fertilizer | any substance used to enrich the soil |
global warming | an increase in the earth's average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect. |
greenhouse effect | an atmospheric heating phenomenon, caused by short-wave solar radiation being readily transmitted inward through the earth's atmosphere but longer-wavelength heat radiation less readily transmitted outward |
natural balance | population equilibrium among organisms and their environments resulting from continuous interaction and interdependency. |
natural resources | the natural wealth of a country, consisting of land, forests, mineral deposits, water, etc. |
nitrogen cycle | the continuous flow of nitrogen through the biosphere by the processes of nitrogen fixation, ammonification (decay), nitrification, and denitrification. Nitrogen is vital to all living matter, both plant and animal; it is an essential constituent of amino |
nitrogen fixation | process as performed by certain bacteria found in the nodules of leguminous plants, which make the resulting nitrogenous compounds available to their host plants |
nonrenewable resources | cannot be replaced |
ozone | In the upper atmosphere, it absorbs ultraviolet rays, thereby preventing them from reaching the surface of the earth. |
pollution | the introduction of harmful substances or products into the environment |
recycle | to treat or process (used or waste materials) so as to make suitable for reuse |
renewable resources | can be replaced |
rotation of crops | the system of varying successive crops in a definite order on the same ground, esp. to avoid depleting the soil and to control weeds, diseases, and pests |
smog | smoke or other atmospheric pollutants combined with fog in an unhealthy or irritating mixture |
strip cropping | the growing of different crops on alternate strips of ground that usually follow the contour of the land, a recourse to minimize erosion |
terraces | a nearly level strip of land with a more or less abrupt descent along the margin of the sea, a lake, or a river |
topsoil | the fertile, upper part of the soil |
water cycle | the movement of water through the ecosystem |
windbreaks | a growth of trees, a structure of boards, or the like, serving as a shelter from the wind |
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