Plate tectonic theory is based on
a. a thermal convection model in which cool
material in the earth’s mantle rises and spreads
laterally beneath the crustal plates.
b. the idea that the earth’s crust is fragmented into
rigid crusts that are sinking slowly beneath
crustal plates.
c. the idea that coacervate formation causes
continents to drift apart slowly on their crustal
plates.
d. observations that the sea floor is slowly
spreading away from oceanic ridges due to
thermal convection in the mantle.
e. all of these.
Answer: d
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