A "mystery" in our understanding of plate tectonics has been, until recently, the nature of the power source capable of moving the plates and the continents embedded within them. Recent evidence indicates the power source to be ____
A) the readjustment of the surface to continual shrinking of the whole Earth
B) convection currents within Earth's mantle moving the plates
C) the action of ocean currents dragging along the seafloor, causing the seafloor and the continents to move
D) the continual vibration from earthquakes and volcanoes slowly moves the continents equator-ward under the influence of centrifugal force
B
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In his 2005 book, Last Child in the Woods, Richard Louv maintains that today's children ________.
Fill in the blank(s) with the appropriate word(s)
A(n) ____________ causes damage by interfering directly or indirectly with the mechanical or biochemical processes
of an organism. Fill in the blank(s) with the appropriate word(s).
These high-latitude, periglacial soils contain about half of the pool of global carbon
A) Gelisols B) Spodosols C) Oxisols D) Mollisols
Abundant light and constant nutrient input make ________ among the most productive ecosystems on Earth
A) estuaries B) lakes C) fens D) streams E) bogs