Practice mode Reading Comprehension

According to the passage about thunder and lightning, what causes the sound of thunder?

Read the passage: Thunder is the sound made by lightning. A lightning bolt heats the air along its path to temperatures several times hotter than the surface of the Sun in a tiny fraction of a second. The heated air expands so violently that it creates a shock wave, which we hear as a crack or a long rumble. Because light travels far faster than sound, we see the flash almost instantly but hear the thunder later. Sound covers roughly one kilometre in three seconds, so counting the seconds between flash and thunder and dividing by three gives a rough idea of how many kilometres away the storm is. If the gap is very short, it is wise to move indoors at once.

Correct answer C. Air expanding violently after being heated by lightning

Explanation

The passage explains that lightning heats the air so much that it expands violently and creates a shock wave, which we hear as thunder.

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According to the passage about thunder and lightning, what causes the sound of thunder?

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