The most accurate record of glaciations in the last 2 to 3 million years was ___________.

Question

Quizplus · Accepted Answer

Studying plankton skeletons in deep-sea sediment cores provides the most accurate record of glaciations in the last 2 to 3 million years, as changes in the composition and abundance of plankton can be used to infer changes in climate and ocean conditions. This method has been widely used by scientists to reconstruct past climate and glacial fluctuations. Physical and laboratory study of glacial landforms and loess can provide valuable information about past glaciations, but these methods have limitations in terms of spatial and temporal resolution compared to studying plankton in sediment cores from the deep sea. Coring sediments in high mountain lakes is also useful for studying past glaciations, but it may not provide as complete a picture as the deep-sea sediment cores because it is limited to a specific geographic region.

The Most Accurate Record of Glaciations in the Last 2