I am cold and hard, but turn into water when it gets warm. I can also be fun to skate on if you have skates. What am I?

I stand still but show how heavy something is. What am I? Solve the riddle → What is orange, good to chew on, and is said to help you see better in the dark? Solve the riddle → It has a thumb and four fingers, but it can neither clap nor point. What is it? Solve the riddle → I have a little tail but no body, and make you take a short break when you read. What am I? Solve the riddle → I have a top but no legs. Many want to climb me. What am I? Solve the riddle →