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?,

hydrosphere

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