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:
But, there are so many variables that determine the amount of caffeine in a cup of coffee, it is near impossible to estimate an exact amount. 1  Caffeine varies by roasting type. 2  Different types of beans will produce more caffeine than others.  The finer that a coffee is ground the more caffeine it will contain.