How scientists can determine age and other features of a rock or other material.
In this video, David Stalhe shows how he studies tree rings and what they can tell about history.
This video follows scientist Jim White as he studies old ice cores in order to find out what may happen in the future in relation to global warming.
Reviews how scientists use abiotic information to study past climates.
Ice cores contain information about Earth's environment for the past 1.5 million years including temperature, geological activity and atmospheric composition.