East Asia is home to ______________ of the human population.
Fill in the blank(s) with the appropriate word(s).
one-fifth
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Sustainable agriculture and organic agriculture are examples of:
A. Alternatives to conventional agricultural practices B. Traditional agricultural practices C. Conventional agricultural practices D. Historic agricultural practices
Many economically important metallic elements like gold and silver are disseminated throughout magma. Why are we able to mine these metals?
A) They are easy to pick out of lava flows with tools that reach a few meters away. B) They don't melt; they float in lava flows and are then trapped when the lava melts; humans go in and mine the lava flows. C) They become concentrated by fractional crystallization into the last bit of the magma that remains after most of the silicate minerals have formed. D) They float up to the surface of the lava and harden on top of the flow.
If you collect a jar of muddy water from a puddle or ditch and then let the mud settle out over many hours, you have separated much of the mud from the water using a process very much like the
A) grit chamber in a wastewater facility. B) primary treatment in a wastewater facility. C) secondary treatment in a wastewater facility. D) trickling-filter system in a wastewater facility.
A region could be defined on the basis of:
a. surface configuration. b. agricultural use. c. vegetation. d. all of these