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Earth is largely covered by water: oceans, lakes, and rivers make up 71% of the Earth's surface, which explains why, when looking at our planet from space, it appears as a large blue ball. When did oceans and seas form? What's the difference between a sea and an ocean? What organisms live in the marine ecosystem? Discover many interesting facts by reading the atlas and challenging yourself by answering the questions on the cards and building the puzzle.
