Using the left mouse button, select piece and drag into position. Pressing the right mouse button rotates piece. If you need a hint, press the "V" key to view the whole image. Change the number of pieces: 9 | 24 | 48 | 160.
Cumulonimbus clouds are much larger and more vertically developed than cumulus clouds which form in a more stable atmosphere. They can exist as individual towers or form in a line of towers called a squall line. Underneath they are dark and menacing. At a distance they rise up like huge white mountains when the Sun shines on them, and are commonly topped with anvil-shaped heads. This cloud has yet to form an anvil. To learn more about thunderstorms go to JetStream - an Online School for Weather.