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EARTH: 1 of the 3 Cs in the geological-period mnemonic "camels often sit down carefully--perhaps their joints creak..."
C
R
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T
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C
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_
_
S
(
_
R
C
_
M
B
R
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_
N
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R
C
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R
B
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N
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F
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R
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S
)
Clue
GREENHOUSE EFFECT
CRETACEOUS (OR CAMBRIAN OR CARBONIFEROUS)
CLOUDS (LUMINOUS)
THE CAYMAN ISLANDS
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