>3. What makes thunder? > >If you thought, Lightning! then - TopicsExpress

>3. What makes thunder? > >If you thought, Lightning! then hats off to you. But I had a more illuminating answer in mind. The air around a lightning bolt is superheated to about five times the temperature of the Sun. This sudden heating causes the air to expand faster than the speed of sound, which compresses the air and forms a shock wave; we hear it as thunder. > > >4. Can rocks float? > >In a volcanic eruption, the violent separation of gas from lava produces a frothy rock called pumice, loaded with gas bubbles. Some of it can float, geologists say. Ive never seen this happen, and Im thankful for that. >

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