Final answer:
Isotopic composition in Andean precipitation is influenced by evaporation and condensation processes, as determined by studies of ice cores. These cores record Earth's climate history, including temperature and CO2 levels over hundreds of thousands of years.
Step-by-step explanation:
Recent studies suggest that isotopic composition of Andean precipitation is mainly controlled by local evaporation and condensation processes. Ice core samples, such as those from the Antarctic, provide valuable insights into Earth's climate history. They contain bubbles of air and biological evidence, indicating past temperatures and CO2 levels. These cores show periodic cycles of temperature changes corresponding to natural climatic events. Moreover, tropical forests contribute to the regulation of the hydrologic cycle and can impact climate change through mechanisms such as transpiration.