Quizlet is a great flashcard site that helps you create your own flashcards, and provides you with some great ready-made flashcards as well. As an ESL teacher, I find it to be very useful, especially for students who are not native speakers and do not have anybody at home to help them with their vocabulary.
The atmosphere, the ocean, and the terrestrial biosphere. Carbon can be found in the earths oceanic and continental crust in different types of stones as well as in the soil from the decay of organic matter.
The carbon sink in the land biosphere has grown during the past 30 years, taking up much of the carbon dioxide produced by human activities.The first signs of this growth levelling off have been spotted in Amazon forests. See Letter p.344.ut all has not been well with this picture. Those concerned with the constraints on vegetation growth caused by limiting resources (such as nutrients, water, heat or light) have warned against the idea that the land carbon sink will continue unchecked in the future.