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:
According to FDA guidelines, decaffeinated coffee must have 97% of the caffeine removed. In actuality, the caffeine content of coffee beans varies widely; therefore the caffeine content of decaffeinated coffee. also fluctuates, and can be 10mg or more per 12 ounce cup.5 Other measurements found caffeine levels.