You are sitting inside your house on a sunny afternoon. The shades are drawn and you look at the window and notice the Sun disappears for about 10 seconds. The alternate light and dark period lasts for nearly 30 minutes. The clouds passing in front of the Sun are ___________________ _ clouds.
Fill in the blank with correct word.
Question 2
In regions where there are no clouds, it is difficult to observe the movement of air using satellite imaging. To help with this situation, geostationary satellites are equipped with ____ that can profile the distribution of atmospheric water vapor in the middle and upper troposphere.
a. special radiometers
b. water-vapor sensors
c. ultraviolet imaging sensors
d. computer enhancement software
e. reflected light imaging capabilities
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