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.
Clouds are typically identified based upon your observation point. From sea-level, you might observe stratus clouds enveloping the top of a mountain. However, if you were on the mountain top and in that same cloud, you would observe and report fog. These clouds would be considered fog from this view. To learn more about clouds go to JetStream - an Online School for Weather.