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var r_text = new Array ();
r_text[0] = "Earth is the only known planet with liquid water on its surface, and the home of all known life in the universe.";
r_text[1] = "Of the Earth's water, 97% is ocean or sea, 2% is frozen and unusable, and 1% is suitable for drinking.";
r_text[2] = "Water is formed by Hydrogen and Oxygen. A molecule of water is formed when two atoms of Hydrogen bond with one atom of Oxygen and become H2O.";
r_text[3] = "Water is unique, it is the only natural substance found on Earth in all three states of matter, solid (ice), liquid (water), and gas (water vapor).";
r_text[4] = "The water cycle, also known as the hydrologic or H2O cycle, describes the continuous movement of water on, above and below the surface of the Earth.";
r_text[5] = "There is the same amount of water on Earth now as when the planet formed so there could be water coming from the faucet that contains certain molecules that dinosaurs drank.";
r_text[6] = "There are two kinds of water on the Earth, saltwater and freshwater. Saltwater means seawater (water from the oceans and seas), which contains salt.";
r_text[7] = "Approximately 71% of the Earth's surface is covered by one continuous global body of saltwater divided into a number of oceans and seas.";
r_text[8] = "Average salinity is 35 parts per thousand (3.5% ppt) and nearly all seawater has a salinity in the range of 30 - 38 ppt, supporting all types of marine forms of life.";
r_text[9] = "When scientists measure salt in water they usually say they are testing for salinity.";
r_text[10] = "It doesn't take much salt to make water salty. If 1/1000 one-thousandth (or more) of the weight of water is from salt, then the water is salty.";
r_text[11] = "Saltwater can be desalinated for use as drinking water by going through a process to remove the salt from the water. Scientists are working hard to make the process more affordable.";
r_text[12] = "If all the Earth's water were fit into a gallon jug, the freshwater available for use would equal only about a tablespoon.";
r_text[13] = "1 gallon of water weighs approximately 8.35 pounds (lbs) and is equal to 3.78 liters.";
r_text[14] = "Less than 1% of the water supply on Earth can be used as drinking water.";
r_text[15] = "Humans cannot drink salt water.";
r_text[16] = "The average human body is 70% water.";
r_text[17] = "Human brains are 75% water, human bones are 25% water, human blood is 83% water, human lungs are 90% water, human skin is 70% water.";
r_text[18] = "Water boils at 212 degrees Fahrenheit (F) or 100 degrees Celsius.";
r_text[19] = "Water freezes at 32 degrees Fahrenheit (F) or 0 degrees Celsius.";
r_text[20] = "Water is the only common substance that expands rather than contracts when it freezes.";
r_text[21] = "Ice is 9% to 11% larger than water at the same temperature, which is why ice floats and the seas don't freeze solid from the bottom up.";
r_text[22] = "Water vaporizes (vapor refers to water's gas state) at any temperature over 75.2 degrees Fahrenheit (24 degrees Celsius.)";
r_text[23] = "A cloud is formed when air heated by the sun rises from the Earth and then slowly cools so that the water in the air condenses; the process by which water vapor in the air changes into liquid H2O is called condensation.";
r_text[24] = "Evaporation is the process by which water changes from a liquid to a gas or vapor and rises into the air. The sun's energy is used to break the bonds that hold liquid water molecules together.";
r_text[25] = "The five Great Lakes (Superior, Michigan, Huron, Erie and Ontario), are fresh water and their combined area represents the largest freshwater surface on Earth.";
r_text[26] = "Over 90% of the world's supply of freshwater is located in Antarctica.";
r_text[27] = "The Earth's southernmost continent has 70% of the freshwater frozen as ice and 90% of the planet's ice.";
r_text[28] = "NASA allots each shuttle astronaut 6 gallons of water a day. It is a necessary restriction because of water's weight and storage volume, and the required fuel calculations.";
r_text[29] = "Hippocrates (hih POK ruh teez), known as the father of Western medicine, directed the people of Greece to boil water before drinking it 24 centuries ago.";
r_text[30] = "The average person in the United States uses 80 - 100 gallons of water each day. In medieval times a person would use about 5 gallons a day and running water was how fast you could carry it home.";
var i = Math.round(30*Math.random());

document.write(r_text[i]);

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