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Flash Crash Rumble and Roll (Let's Read and Find Out)
Flash Crash Rumble and Roll - Let's Read and Find Out Author:Franklyn M. Branley Everyone knows what a thunderstorm is. Big, dark clouds form in the sky. The rain falls fast and hard. Lightning flashes again and again, and you hear the thunder crash, rumble, and roll. But what makes a thundercloud? What is a bolt of lightning? And why does thunder sometimes sound so loud?