ACTIVITY 78:Read the text below, click on the gaps
and decide which word best fits each gap. Then check the correct answers.
OUR EARTH CHANGES Although the earth was formed
about 4,500 million years ago, human beings have it for less than half a
million years. Within this time, population has increased hugely
and people have had a vast upon the earth.
They have long been able to the forces of nature to use.
Now, with modern technology, they have the power to alter the
balance of life on earth.
Reports back from the first astronauts helped dispel the dangerous that the world had no
boundaries and had limitless resources. , ecologists have shown that
all forms of life on earth are interconnected, so it that all human activity has
an effect on the natural environment.
In recent years, people have been putting the environment under
stress. As a result, certain materials such as timber,
water and minerals are beginning to short. Pollution and the of waste are already critical
issues, and the of the environment is fast
becoming the most pressing problem us all. The way we respond to
the challenge will have a profound effect on the earth and its life
However, despite all these threats there are signs. Over the past few
decades, the growth in population has been more than matched by food
production, indicating that we should be able to feed ourselves for
some time yet.