Past surface temperature can be determined from Vostok ice cores by

Question

Quizplus · Accepted Answer

Oxygen isotope ratios in ice cores can provide a proxy for past surface temperatures. The ratio of oxygen isotopes varies with temperature, so by analyzing the isotopic composition of the ice, scientists can estimate past temperatures. Choice A (pollen counts) and B (tree rings) would not be useful in analyzing temperature as they are indicators of past vegetation and climate patterns, respectively. Choice D (gas temperatures) is not directly related to surface temperature and therefore is not the best choice for determining past temperatures.

Past Surface Temperature Can Be Determined from Vostok Ice Cores