BBB Customer Reviews Rating represents the customers opinions of the business. The Customer Review Rating is based on the number of positive, neutral and negative customer reviews posted that are calculated to produce a score. BBB letter grades represent the BBB's opinion of the business. The BBB grade is based on BBB file information about the business. In some cases, a business' grade may be lowered if the BBB does not have sufficient information about the business despite BBB requests for that information from the business.
Clouds are made up of tiny water droplets or ice crystals, usually a mixture of both. The water and ice scatter all light, making clouds appear white. If the clouds get thick enough or high enough all the light above does not make it through, hence the gray or dark look.
Water clouds tend to have sharp edges, and ice clouds are more wispy. Middle clouds include altocumulus and altostratus clouds. These are usually water clouds, except when it is cold enough at that altitude in the atmosphere for ice crystals to form. Low clouds include stratocumulus, cumulus, stratus, cumulonimbus, and nimbostratus clouds. These clouds are generally made of water droplets. Cumulus and cumulonimbus clouds can be very tall, with their tops as high as middle or high level clouds, but their bases are as low as the other low clouds. For tips on how to tell how high a cloud is in the sky, look for clues on each cloud type page.