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.
Since the organic solvents used to extract the caffeine from the beans are fairly volatile (the boiling point of dichloromethane is 40ÂºC to 103ÂºF), only trace amounts of solvent remain after the beans are dried. Furthermore, since the beans are roasted later, residual solvent should not pose a health threat.
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.