Interdependence. Interdependence is a key idea in science. As students learn about science, they begin to understand that the earth is not a group of discrete parts but a continuous environment existing over time as well as place.
In order to remove the caffeine from coffee beans, the beans are washed in a solvent (a liquid capable of dissolving substances), transferring the caffeine from bean to liquid in a process known as extraction. To extract caffeine from whole coffee beans, the following solvents can be used:
Decaf tea or decaffeinated tea has most of the tea extracted through a chemical process. Decaf tea still contains some caffeine, and not just traces, but just a small amount. â¦ This can be a matter of concern for people who have extreme sensitivities to caffeine for medical reasons, but it's enough that most people would not notice it.