Demonstrate for your earth scientists how plant pollen of the past has become part of sedimentary deposits, providing clues about ancient climates. Then give them simulated sediment layer samples to analyze for different types of paper punch pollen. As they examine each layer, they track the percentage of pollen types in each. They then form a hypothesis on what the climate might have been like as each layer was deposited. This terrific lesson exemplifies how different branches of science overlap and can be used in your geology or climate studies. Be aware that it requires quite a bit of preparation time, but you will find it worthwhile!