Question

a low altitude cloud that is fog - like and gloomy. *
choose
this is a required question
a mid - altitude cloud that covers the entire sky with a grey/blue grey sheet - like appearance
choose
a cloud that develops vertically and towers into higher altitudes with a dark base and an anvil shaped top. also called \thunderstorm clouds\. * 1 point
choose

Explanation:

1. A low - altitude, fog - like and gloomy cloud is stratus. Stratus clouds are often low and give a dull, overcast appearance.
2. A mid - altitude cloud that covers the entire sky with a grey/blue - grey sheet - like appearance is altostratus. Altostratus clouds are mid - level clouds that can create a uniform, overcast layer.
3. A cloud that develops vertically, towers into higher altitudes with a dark base and an anvil - shaped top (thunderstorm clouds) is cumulonimbus. Cumulonimbus clouds are associated with severe weather and have a distinct vertical development and anvil - like top.

Answer:

1. Stratus
2. Altostratus
3. Cumulonimbus