A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the earth. While this is true of any map, these distortions reach extremes in a world map.
"A Map of Middle-earth" is the name of two colour posters by different artists, published in 1965 and 1970 by the American and British publishers of J. R. R. Tolkien's book The Lord of the Rings. Both posters were based on Tolkien's maps and work by his son Christopher to depict the fictional Middle-earth .
Earth is the only planet in the Solar System that has a large amount of liquid water on its surface. About 74% of the surface of Earth is covered by liquid or frozen water. Because of this, people sometimes call it the blue planet. Because of its water, Earth is home to millions of species of plants and animals which need water to survive.