Weather Quiz: Clouds   It is the wind in the atmosphere which
causes cloud formations to appear to move across the sky. What's
more, on a day when clouds are appearing at different levels,
you may notice them moving in different directions indicating
changing wind direction at different levels.  Move on to the
next question.  SPEC scientists, Tara Jensen and Pat Zmarsley,
monitor a Cloud Particle Imager during MWISP. 2. Cloud droplets
are very tiny, usually less than 3 micrometers. How many cloud
droplets are needed to make the average raindrop?  A. 1 Thousand
B. 100 Thousand C. 1 Million D. 1 Billion  Choose any one of the
four answers above.