Because when the sun hits the earth there is a chemical that makes the colour of a river blue.
No color will mix with green to get blue. Blue is a primary color when mixed with another primary color, yellow, produces green.
Windex is typically a bright blue color.
Red color in acidic solutions and blue color in basic solutions.
In light, it is the color you get when you mix blue and green.
Blue does not absorb blue light; rather, it reflects blue light, giving it its color.
Rivers are typically depicted as blue on a map to differentiate them from other features like land and roads. The blue color represents water, reflecting the natural color of many rivers.
Because earth has gots loads of lakes,rivers and seas.
Blue, in the case of water in our 4 oceans, seas, rivers, and lakes.
Blue, Blue stands for water on a map and on the Earth there is more oceans, rivers, lakes, creeks and streams than land.
blue is a color like the color of blue diamonds Blue is a color
When you look into an ocean or a lake, the water looks like it's blue. But, up close, water isn't really blue. It's only blue when you look at it in big groups, (like an ocean or a lake, a pond etc.), because the sky is blue, so the color of the sky makes a blue reflection on the water, making it look blue. So, on a map, if you drew water as clear, nobody would be able to tell there was anything there at all! So, water on a map is drawn blue instead.
Blue is the color of the sky!
Blue is the color blue of course!
Google Maps, Yahoo! Maps and British Ordinance Survey maps use a mid-blue colour for all water features (rivers, streams, lakes and the sea).
No, blue is not the most common color on world maps. Green is typically the most prevalent color due to representing landmasses. Blue is commonly used to depict bodies of water like oceans, seas, and rivers.
no, the apparent blue color is actually the reflection of the sky in the water, if the water is clean the color of the sky will be reflected, blue or gray on a gray cloudy day, dark on a moonless night, silver reflecting the moonlight at night. Silt, alge, mud or other material in the water can also affect the color. Green Bay and the river flowing into in Wisconsin are in fact green from the green alge at certain times of the year. Its easy to see a color difference where two rivers meet and one is clean and one is slit laden.
Blue is a color.