Snowflakes are the result of symmetrical crystallization of water molecules as they turn into ice crystals. Water molecules, when pass to crystalline solid state, such as in ice and snow, form weak bonds (called hydrogen bonds) in which two hydrogen atoms tend to attract neighboring water molecules. When the temperature drops below the freezing point, [...]
CFCs are hydrocarbons in which some or all of the hydrogen atoms have been replaced by fluorine atoms. They are often used as refrigerants, solvents and until recently as propellants in aerosol cans. When released, they rise high into the Earth’s atmosphere where they interact with the Sun’s ultraviolet rays.
From The Handy Science Answer Book: there is no single cause for the colors of the sea. It depends in part on when and from where the sea is observed. There are many differing opinions that support almost any explanation. Some explanations include the absorption and scattering of light by pure water; differences caused by [...]
At 20,320 feet high, Mt. McKinley in Alaska is the highest point in the United States (as well as all of North America). The highest point in the continental United States is Mt. Whitney in California at 14,494 feet. The lowest point is Death Valley, California at 282 feet below sea level. This is also [...]