Low level, thick clouds that reflect incoming solar energy are called

Stratus clouds.

There are varying types of status clouds such as Cumulonimbus clouds, Cumulus clouds, and Stratocumulus clouds.

Cumulonimbus are heavy and dense low-level clouds, extending high into the sky in towers, plumes or mountain shaped peaks.

Cumulus clouds are detached cauliflower-shaped clouds usually spotted in fair weather.

Stratocumulus clouds are low-level clumps or patches of cloud varying in color from bright white to dark grey. They normally have well-defined bases and some parts much darker than others. They can be joined together or have gaps between them. Stratocumulus clouds can be present in all types of weather conditions, from dry settled weather to light rain and snow. 

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