Page 61 - Exercise 6A

Page 61 - Exercise 6A

Here are the answers to the quiz.

1) How much energy is saved when an aluminum can is recycled? The answer is B. Enough to run a TV for three hours. Aluminum is one of the best things to recycle. Because huge amounts of electricity are used to make new aluminum. Up to 95% of that energy is saved when a product is made from recycled aluminum.

2) How many trees was saved in Boulder County in one year? The answer is C. When the people of Boulder County, Colorado, recycle their paper. They saved 500,000 trees in one year. That’s half a million trees that weren’t cut down. And it’s also a huge amount of rubbish that wasn’t dumped too.

3) How much water is used by an average family of four in one day? The answer is A. 800 liters. Almost 3/4 of that (74%) is used in the bathroom. You may think that saving water isn’t important. If you live in a country that gets a lot of rain. But a lot of energy is used to collect clean and pump water to homes, factories, etc. So if you save water you save energy.

4) How much of a modern car is recyclable? The answer is C. In fact, you can recycle more than 75% of a modern car. So it isn’t all bad news.

5) How much energy is used by an electrical appliance. Such as a computer or TV when it is on standby? The answer is B. Up to 25% of the energy it uses when it’s switched on. And the average family has up to 12 appliances on standby at any one time. That’s a lot of electricity which is wasted. In a country like Britain. That’s all the electricity that is produced by two power stations in a year. So, if you aren’t using it, switch it off.

6) How is most petrol wasted in a car? The answer here is A. If you drive over 100 km an hour more petrol will be used per kilometer. However, probably the best answer to this question is most petrol is wasted by using the car when you don’t need too. Walk, cycle or use public transport as much as possible.