People need rockets on their ships because gravity will keep their ships on the ground. I cannot jump as high as I can at home because gravity pulls me down to the ground. That was all I could find about gravity. Dear Fearless Leader, There is a lot of water on earth. Water is a liquid used in many different ways.
Water also comes in many different ways.
Water comes in rivers, streams, creeks, oceans, seas, lakes, ponds, and other ways that humans invented. Water comes in different ways depending on the temperature. When the temperatures are cold there may be frost, snow, sleet, or hail. When it is cold water will turn into a solid called ice. When it is humid dew will form on plants and other things.