 Complete the following phrase:  Whitlock concentrates on the material that is found in lakes, extracting sediment cores that contain the fossils of pollen and particulate charcoal. Pollen grains can provide information about the plants that lived in the lake, meaning Whitlock can work out the vegetation and climate. By studying the charcoal in the sediments, Whitlock can track past fire. She has analysed the sediment cores in both wetlands and natural lakes. She uses the information she can extract from sediment cores to reconstruct historical vegetation, fire and climate. After the 