The rigid crust and uppermost mantle are known collectively as the
A) asthenosphere.
B) lithosphere.
C) Moho.
D) Gutenberg discontinuity.
Question 2
Why is a greenhouse an imperfect analogy for how the Earth's atmosphere behaves?
A) A greenhouse allows longwave radiation to escape and mix with the surrounding air, unlike the Earth's atmosphere.
B) The glass of a greenhouse is designed to allow transmission of both longwave and shortwave radiation, whereas certain atmospheric constituents only allow transmission of shortwave radiation.
C) It is exceedingly rare for a greenhouse to contain carbon dioxide like the Earth's atmosphere contains.
D) Passage of longwave radiation to space is delayed by certain atmospheric constituents, but not trapped like an actual greenhouse.
A soil surface crust that includes nitrogen-fixing, soil-enriching cyanobacteria.
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