Best hard riddles for kids with simple answers

Only one color, but not one size. Stuck at the bottom, yet I easily fly. Present in sun, but not in rain. Doing no harm, and feeling no pain. What Am I?

A little pool with two layers of wall around it. One white and soft and the other dark and hard, amidst a light brown grassy lawn with an outline of a green grass. What am I?

Armored but not a knight, snapping but not a twig, and always at home, even on the move. What am I?

How do you make the number 7 an even number without addition, subtraction, multiplication, or division?

What do you call a fly with no wings?

What is black when you buy it, red when you use it, and gray when you throw it away?

What is as big as you are and yet does not weigh anything?

Mr. Jason was walking along the sea shore. Suddenly it started drizzling and turned into a heavy rain. He wasn’t carrying any umbrella, not even any cap. He was completely wet and all his clothes were soaked in rain. Yet not even a single strand of his hair was wet! How was that possible?

What did the baseball glove say to the baseball?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?