The water cycle is like a circle - it has no beginning and no end. When the sun heats ocean water, it evaporates and forms clouds in the sky. When these particles get big enough, they can fall to Earth as precipitation in the form of rain, sleet, snow, or hail. When water hits the ground, it can change to liquid, soak into the ground, or run off and form streams or rivers. But it always makes its way back to the ocean, where the cycle "begins" again.

This enhanced eBook gives you the freedom to copy and paste the content of each page into the format that fits your needs. You can post lessons on your class website, make student copies, and more.

進階版電子書為開放式的PDF檔案，使用者可以複製/貼上文字以及特定圖片，部份出版社也開放筆記與劃重點的功能，可輕鬆編輯您個人化的電子書，進階版電子書同樣受著作權法保護。