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1.  According to the illustration above, what are the four types of clouds most often found in the lowest level of the troposphere?

2.  Which type of cloud shows vertical development and can be present from 6,000 feet to nearly 50,000 feet?  

3.  What prefix do we use to describe a cloud in the middle layer of the troposphere?

Submitted by: JD Nickels
Source: University Corporation for Atmospheric Research