Plate tectonic theory is based on ____
a. a model in which cool material in the earth's crust rises and spreads laterally beneath the crustal plates
b. the idea that Earth's crust is fragmented into rigid crusts that are sinking slowly beneath crustal plates
c. the idea that sedimentary rock formation causes continents to drift apart slowly on their crustal plates
d. observations that the sea floor is slowly spreading away from oceanic ridges, driven by plumes of magma
welling up from Earth's interior
e. evidence that severe disturbances in Earth’s crust shaped the continents in a single large event
ANSWER: d
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