Not all clouds are equal. Some are puffy and light; others, dark and foreboding. Some form from water droplets or miniature snowflakes. Clouds form on one of three altitudes–high, mid-level and low–that determine their shape and weather impact.
If you knew that much, you might want to test your cloud knowledge with this quiz. Can you predict whether rain will arrive within 12 hours? Can you tell the difference between the similar-looking stratocumulus and altocumulus? See how many cloud types you can name simply by looking at them.