English Language Teaching

National Geographic - Our World

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Page 52 of 131

Republic of Palau, Caroline Islands | A diver in a lake filled with jellyfish. Photographer: DAVID DOUBILET The millions of golden jellyfish that pack Palau's Jellyfish Lake take part in a daily migration that follows the sun's arc across the sky. They do this as solar rays nourish essential, algae-like organisms called zooxanthellae, which live symbiotically in the jellies' tissues and provide their hosts with energy. FACT 53 Adult Keynote NEW 54 Life 56 Outcomes NEW LEVELS 58 World English 60 Just Right 62 Innovations 62 World Link NEW EDITION 63 World Class 63

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