places that it’s not always safe to breathe there.
Слайд 5
Many cities around the world have air polluted
with “smog”. This is so strong in some places
that the air, which should be a beautiful blue, looks brown.
Слайд 6
The planet Earth is mostly water. Oceans cover
the biggest part of it – and there are
lakes, rivers, streams and even water underground. All life on the Earth – from the smallest bug to the biggest whale – depends on the water. It’s precious.