15. are tropical rain forests carbon sinks? why or why not? be sure to include a definition carbon sink in your answer. 16. today we are faced with an increase in carbon dioxide in our atmosphere. imagine, however, that the reverse were true. imagine if there were an decrease in carbon dioxide and a increase in oxygen. what would be the consequences for the temperature of the atmosphere near the surface of the earth? why would a decrease in carbon dioxide caus this?

Will someone earth science water cycle: will someone tell me how the water cycle works, but in a story? ? pretend you are a drop of water somewhere. (like; "once i was floating around in a cloud" or, "once i was lying in a puddle in the middle of a parking lot.) and tell your life story! and use the words "evaporation" "condensation" "accumulation" "transpiration" "precipitation" and "runoff" tell the story like your the drop of water telling your life story. include all the parts of the water cycle including those vocabulary words above. and !

Why are shark population in decline worldwide?

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)