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Water covers about 71 percent of the Earth's surface. Find out more about this colorless and odorless substance found all over Earth.
A hoar frost forms when water vapor freezes directly onto surfaces that are colder than the air surrounding them. The term “hoar” comes from an old English word meaning “signs of old age” - when frost forms on surfaces, it looks like white hair.
Play this puzzle with the Pics n Mix app!
Pics n Mix is quick and easy to learn, and the short video below explains everything you need to know.
Just choose a puzzle and click the Play button. Drag and drop the pieces to where you think they should be. If you have chosen "plus rotation" it means some of the pieces are flipped top to bottom or right to left. If you tap a piece once, it will flip from top to bottom. and if you double tap it, it will flip from left to right.