|> 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, The sun: a friend or an enemy - Vocabulary: Sea animals - Vocabulary: Gardens and gardening...
|> 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.
English exercise "A volcanic eruption" created by anonyme with The test builder.
Click here to see the current stats of this English test
Please log in to save your progress.
End of the free exercise to learn English: A volcanic eruption
A free English exercise to learn English.
Other English exercises on the same topic : Nature | All our lessons and exercises