While thunder won’t hurt you—lightning will! So it’s important to pay attention when you hear thunder.Thunderstorms happen mostly in summer and every thunderstorm has lightning.Lightning can strike people and buildings，which is very dangerous.

　　Thunderstorms affect small areas when compared with hurricanes and winter storms.The typical thunderstorm is 15 miles in diameter and lasts an average of 30 minutes.

　　A volcano is a mountain with a large opening at the top through which melting rock，steam，gases escape from time to time with violent force from inside the earth.When pressure increases，eruptions occur.Gases and rock shoot up through the opening fill the air with small pieces.Eruptions can cause lava flows，hot ash flows，mudslides，falling ash and floods，which is likely to knock down entire forests，cause floods and earthquakes.Fresh volcanic ash can cause damage to the lungs of older people，babies and people with respiratory problems.

　　Terrible Natural Disasters

　　Natural

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