The vast bodies of water surrounding the continents are critical to life on earth. But overfishing and global warming threaten to leave oceans barren. Covering about 70% of the earth's surface, the oceans are a highly productive system which continuously recycles chemicals, nutrients and water through the 'hydrological cycle', which powers Ò€¦

Plate tectonics, post-glacial rebound, and sea level rise continually change the coastline and Ò€¦

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