Upon what evidence did Agassiz base his ice age theory?
A) glacial landscapes in the Swiss Alps that extended far beyond existing ice fronts
B) astronomical calculations for cyclic variations in Earth's orbit
C) stacks of glacial drift with intervening "warm period" soil horizons
D) spectroscopic measurements for variations in the solar output

Question

Quizplus · Accepted Answer

Agassiz based his ice age theory on observations of glacial landscapes in the Swiss Alps that extended far beyond the current ice fronts, indicating that glaciers had once been much more extensive.

Upon What Evidence Did Agassiz Base His Ice Age Theory