premise: In regions of ocean upwelling, carbon rich water from the deep ocean comes to the surface and releases carbon into the atmosphere as carbon dioxide.
hypothesis: Ocean acidification occurs when excess carbon dioxide in the atmosphere causes the oceans to become acidic.
hypothesis_graph_structure: Ocean acidification<>occurs<>when excess carbon dioxide in the atmosphere causes the oceans to become acidic$$$excess carbon dioxide in the atmosphere<>causes<>the oceans to become acidic$$$the oceans<>to become<>acidic