water, lakes, oceans, what is the hydrosphere?, recycling, How can humans make a positive affect on the hydrosphere?, a big ecosystem for fishes and organisms, What is the coil reef?, hydrosphere, where do dolphins belong?, after the cause of Queensland, where is the biggest coral reef?, Orcas (killer whales), who’s at the top of the food chain?, decomposers, plankton and seaweed are, five layers, how many layers are there in the ocean?, it produces more than half of the world‘s oxygen, why is the hydra fear important, the Pacific Ocean, what is the biggest ocean?.

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