Which of the following is true of high clouds? a. they generally produce lightning. b. they are composed of ice crystals. c. they cause most precipitation. d. they are a sign of severe weather.

The correct answer is option B. High clouds are called cirrus, which is a type of cloud that is found at high altitude. They are the result of  dry air ascending to high altitudes and becoming ice.  Therefore high clouds are composed of ice crystals, which are the responsible of giving this type of clouds that white, wispy look.

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