environmental chapter 8
genetic engineering of food crops
a) continues to be debated among scientists b) must be disclosed on food ingredient labels
sand, gravel, crushed rocks
aggregates
2 or more metals combined
alloy
a quarry also could be called
an open pit
land that is good for farming
arable
land where it is possible to grow crops is called
arable land
evaporites most commonly form in
arid regions where rates of evaporation are high
persistent pesticides are those that
become concentrated in organisms high on the food chain
pest populations that damage plants
become resistant to pesticides via natural selection
integrated pest management can include chemical pest control, _____, and mix of farming methods
biological pest control
surface mining can cause
both air and noise pollution
earths available arable land is being reduced by
desertification, soil erosion, fast growing human population
DDT is harmful to the enviro because
doesn't break down, concentrates on the bodies of animals high in the food chain, causes some birds to lay thin eggs
action that contributes to soil erosion
driving machinery over fields over and over
what is one property that may be used to distinguish metallic from nonmetallic minerals
electrical conductivity
dredging stream beds may be an effective technique for mining
gold
gangue minerals
have no commercial value
it is true that soil loss caused by wind and water
is reduced by incorporating strips of vegetation into plowed land
the wall of a coal seam
long wall
through ______ mining companies can identify areas where there may be valuable material
mineral exploration
placer deposits are surface mineral deposits that have been concentrated by
movement of wind and water
what can contaminate a river during dredging
muddy sediment
which of the following is NOT a method of subsurface mining
open pit mining
minerals that contain valuable substances
ore minerals
farmland may become decertified if
overgrazing, too many crops, erosion
pesticides that do not easily break down in the environment
persistent
minerals concentrated by wind and water movement into surface deposits
placer deposits
process of returning land to its original condition after mining
reclamation
when farmers uses no till - farming methods,
seeds are planted among the roots of the previous crop
from whom must mining companies obtain permits before mining a site
state and federal agencies
the sinking of regions of the ground with little/no horizontal movement
subsidence
mining method used when deposits are close the the earths surface
surface mining
the first step in surface coal mining is
to remove and set aside the soil that's ontop
which of the following agricultural products requires the least amount of energy
wheat
