The most notable trace in the geologic record of human activities is likely to be a(n) ____.
A) more diverse pollen record
B) concrete and metal debris field left from cities
C) expansion of farmland
D) increase in carbon dioxide levels, as recorded by ice cores
E) more alkaline ocean

Question

Quizplus · Accepted Answer

The increase in carbon dioxide levels, as recorded by ice cores, is the most direct and significant trace of human activity in the geologic record. This increase can be linked to the burning of fossil fuels and other human activities that release carbon dioxide into the atmosphere. Other options may also leave some trace in the geologic record, but none are as directly linked to human activity as the increase in carbon dioxide levels.

The Most Notable Trace in the Geologic Record of Human