It has been updated to reflect announcements made by the state of Hawaii and the government of Palau and to highlight additional statistics and tips.
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Magazine How one image captures 21 hours of a volcanic eruption. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit.
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From massive marine mammals like whales to the tiny krill that form the bottom of the food chain, all life in the ocean is interconnected. While the ocean seems vast and unending, it is, in fact, finite; as the climate continues to change, we are learning more about those limits.
Explore these resources to teach students about marine organisms, their relationship with one another, and with their environment. Learn the risks our world's coral reefs are facing and what they mean for our future and the future of the ocean.
A reef is a ridge of material at or near the surface of the ocean. There are natural and artificial reefs. Join our community of educators and receive the latest information on National Geographic's resources for you and your students. Skip to content. For example, herbivores like parrotfish and sea turtles graze on algae and help keep algae populations under control.
When herbivore populations decline, coral reefs can quickly become overtaken with algae. Clean Water When polluted runoff and wastewater enter the marine environment, they carry chemicals, nutrients, and bacteria that can be harmful to coral reefs and spur the growth of algae that competes with corals for space. Ensuring Clean Water for Reefs.
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