diagram practise

Topics: World population, Population growth, Population Pages: 3 (660 words) Published: February 8, 2014
You should spend about 20 minutes on this task.
The following diagram shows how greenhouse gases trap energy from the Sun.

Write a report for a university lecturer describing the information shown below. Write at least 150 words.

Complete the answer by filling the gaps with a word or phrase from the box below. lead to
release
result in
subsequently
fell
reach
less
decades
amounts
as a result of
 
Energy from the Sun .................... the Earth as heat. Some of this heat energy is.................... radiated into space, while some of it is trapped by greenhouse gases in the atmosphere and reflected back to Earth. This is a natural process, but in recent...................., human activities have .................... an increase in the.................... of greenhouse gases in the atmosphere which is now trapping too much heat.

One of the main greenhouse gases is carbon dioxide, and extra quantities of this.................... into the atmosphere .................... burning fossil fuels as a source of energy in power stations, factories and homes. Exhaust gases from cars and lorries.................... further emissions of carbon dioxide.

Plants serve to remove some of the carbon dioxide from the atmosphere by absorbing it through their leaves. However, as large areas of forest .................... in the Amazon and elsewhere,.................... carbon dioxide is removed in this way.

The diagram below shows the production of steam using a gas cooled nuclear reactor.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words.

model answer:
A gas-cooled nuclear reactor consists of the reactor itself and a heat exchanger. The reactor contains uranium fuel elements which are surrounded by graphite moderators and topped by charge tubes for loading fuel elements, and boron control rods. The whole reactor is contained in a pressure...
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