Why is the green revolution unlikely to be the final answer in terms of feeding the billions of people that are, and will be, living on the earth?
What will be an ideal response?
?Without large inputs of water and synthetic inorganic fertilizers and pesticides, most green revolution and genetically engineered crop varieties produce yields that are no higher (and are sometimes lower) than those from traditional strains. These high inputs also cost too much for most subsistence farmers in less-developed countries.
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The dominant gas emitted from volcanoes is ____________________. Fill in the blank(s) with the appropriate word(s)
Explain how heat is transferred by conduction, convection, radiation, and latent heat exchange in a pot of boiling water on a stove
Which is an important type of physical weathering?
A. Minerals dissolve in water. B. Water freezes and expands within pore spaces and fractures. C. Plant roots excrete organic acids. D. Minerals react with water and change shape.
Beach replenishment projects that add sand to eroding beaches
A. must match the grain size of the sand, because finer sand will be carried away quickly by the ocean currents and coarser sand could result in a steeper beach face. B. are a hard/structural approach to beach stabilization. C. are fairly inexpensive. D. are a permanent solution to beach erosion that will never have to be repeated.