This life allowing compound this formed when two atoms of hydrogen form a covalent bond with an atom of oxygen. It is the most common substance found on planet Earth, yet two and half billion people on Earth do not have access to clean form of it to drink. Two-thirds of all the Earth’s fresh water is found frozen and entombed in glaciers. The rest is found in the ground. A gallon of this substance weighs approximately eight pounds. The compound has several unique properties. Because of the high specific heat of water, it doesn’t change temperature anywhere near as fast as air. This is why it may be hot outside, but a pool or lake is still freezing. When it changes form from a liquid to a solid (freezes) it expand in size just about ten percent larger. If all of the water on Earth-fresh and salt, underground and above, solid, liquid, and vapor-was collected, it would form a sphere with a diameter of about 860 miles, and a volume of approximately 332.5 million cubic miles (a cubic mile of water contains about 1.1 trillion gallons)! This collection of worksheets introduces students to water: where it came from, how it gets to the tap, and how important it is to the body. Questionnaire sheets and answer keys are provided.
This series of worksheets will explore common questions about this substance that is commonly on all our minds. We will find out where it comes from and how it got on Earth in the first place. We will also look at unique properties of it nature in the form of waves and floating ice. Fun Fact: Water can dissolve more substances than any other liquid. Some scientists refer to it as the "Universal Solvent."