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    Learn English > English lessons and exercises > English test #3111: A volcanic eruption
    > Other English exercises on the same topic: Nature [Change theme]
    > Similar tests: - In the sea - Animals and pictures - Fruit-trees - In the garden-vocabulary - Flowers - Vocabulary: Sea animals - Vocabulary : Animal sounds/cries - Birds and their nests
    > Double-click on words you don't understand


    A volcanic eruption


    A volcanic eruption

    Volcanic ash is rock that has been pulverized into dust or sand by volcanic activity. In very large eruptions, ash is accompanied by rocks having the weight and density of hailstones. Volcanic ash is hot near the volcano, but it is cool when it falls at greater distances. Ashfall blocks sunlight, reducing visibility and sometimes causing darkness. Ashfall can be accompanied by lightning. Fresh volcanic ash is gritty, abrasive, sometimes corrosive, and always unpleasant. Although ash is not highly toxic, it can trouble infants, the elderly and those with respiratory ailments. Small ash particles can abrade the front of the eye under windy and ashy conditions. Ash abrades and jams machinery. It contaminates and clogs ventilation, water supplies and drains.

    Ash also causes electrical short circuits, in transmission lines (especially when wet), in computers, and in microelectronic devices. Power often goes out during and after ashfall. Long-term exposure to wet ash can corrode metal. Ash accumulates like heavy snowfall, but does not melt. The weight of ash can cause roofs to collapse. A one-inch layer of ash weighs 5-10 pounds per square foot when dry, but 10-15 pounds per square foot when wet. Wet ash is slippery. Ash resuspended by wind, and human activity can disrupt lives for months after an eruption.





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    1. Find in the text the word which gives an idea of the size of the rocks:

    2. Give the immediate consequence of an ashfall: .

    3. Is ash toxic? .

    4. Can it have bad effect on old people, though? .

    5. Ash is bad for the eyes, isn't it? .

    6. Ash causes problems to machines, doesn't it? .

    7. Ash is bad for the air we breathe, I suppose. .

    8. What about the water? .

    9. What about the electricity? .

    10. Does wet ash cause problems too? .

    11. Ash doesn't melt, does it? .

    12. Are people affected by a volcanic eruption for a long time? .









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