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Additional info for Developing english competencies 3: for Senior High School (SMA MA) grade XII of natural and social science programmes

Sample text

1. Other people who prefer to believe in scientiÀc explanation have suggested that electrical forces in the atmosphere caused this and other incidents. 3. Meanwhile, a local lorry driver following the same route as Mrs Knowles conÀrmed that he had also seen the strange light in the distance. 4. In a state of shock, they drove to the nearest town and reported the incident to the police. 5. Thinking that the woman must have been so tired that she was dreaming, the police gave her a cup of tea hoping to calm her down.

In contrast, heavy rainfall and Áooding occurred in parts of North and South America. In 1997, there were severe storms and floods in Mexico and further north along the west coast of the United States. The converse of the El Niño effect is the La Niña effect, which is an exaggeration of normal conditions. This takes place when trade winds blow strongly and consistently across the PaciÀc towards Australia. This pushes the warm waters from the central PaciÀc, off the northern Australian coast, to build up into a mass that is bigger than normal.

Acid Rain Acid rain is rain that is highly acidic because of sulphur oxides, nitrogen oxides, and other air pollutants dissolved in it. Normal rain is slightly acidic, with a pH of 6. 8. Acid rain can severely damage both plant and animal life. Certain lakes, for example, have lost all Àsh and plant life because of acid rain. Acid rain comes from sulphur in coal and oil. When they burn, they make sulphur dioxide (SO2). Most sulphur leaves factory chimneys as the gaseous sulphur dioxide (SO2) and most nitrogen is also emitted as one of the nitrogen oxides (NO or NO2), both of which are gases.

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