Weather forecasting
A) involves a set of interlocking problems, each difficult to solve in isolation let alone in combination.
B) involves a set of interlocking problems, each easy to solve in isolation but difficult in combination.
C) should be an exact process within five years.
D) should be an exact process within 20 years.
Answer: A
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The outer, rigid part of the Earth consisting of the upper mantle, oceanic crust, and continental
crust; this layer is divided into plates: a. lithosphere d. biosphere b. asthenosphere e. mesosphere c. atmosphere
The propagation of a wave around an obstacle is called ____
a. wave reflection b. wave refraction c. plunging waves d. wave diffraction e. interference
Which element accounts for nearly half the mass of the earth's crust?
A) carbon B) iron C) oxygen D) silicon
Grasslands typically lack trees because seedlings have difficulty surviving the
A. temperate environment. B. high temperatures. C. frequent occurrence of fire. D. changing soils.