In developed countries, the most recent increases in agricultural productivity have come from ________
A) extensive drip irrigation use in farming
B) clearing grasslands and savannas
C) clearing rainforests
D) new crop varieties and polyculture techniques
E) irrigation in arid areas
D
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Which areas of the globe would likely be mapped on a planar projection, and why?
Figure 4.5a shows Earth on a planar projection, in which the globe is projected onto a plane. This is a gnomonic projection and is generated by projecting a light source at the center of a globe onto a plane that is tangent to (touching) the globe’s surface. The resulting increasingly severe distortion as distance increases from the standard point prevents showing a full hemisphere on one projection.
Figure 4.5 (a) Gnomonic/planar projection
Elliptical galaxies
A. have little in the way of dust and gas. B. tend to be smaller than the other types of galaxies. C. are thought to be former starburst galaxies. D. all of the above
What occurs during compaction?
A) A machine takes the sediment and stomps it down as much as possible. B) Sediment is heated up which causes it to condense. C) Additional layers of sediment accumulate and press down on the layers underneath them. D) Sediment crystallizes which causes it to condense.
The zone of ocean water where photosynthetic organisms have enough light to thrive is called the ____
A) disphotic zone B) euphotic zone C) aphotic zone D) mesopelagic zone