Assertion: cumulonimbus cloud | /r/AtLocation | the wall cloud
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Source sentences:
text: Closer to the ground, cumulonimbus clouds are also responsible for shelf clouds (arcus cloud feature), wall clouds (murus cloud feature), tail clouds attached to the wall cloud (cauda cloud feature), a beaver tail cloud that acts like a river of moisture feeding into the storm (flumen cloud accessory) and even funnel clouds (tuba cloud feature).