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Fertilizer (n) – natural and man-made
material that is spread on soil to help plants to grow.
Flood (n) – an overflowing of water onto land that is normally
dry.
Food chain (n) – a series of organisms in which the organisms
in each level of the series use organisms in the next lower level as
food.
Forest (n) – an area of land that is covered with a dense
growth of trees, shrubs and plants.
Fossil fuel (n) – a non-renewable source of energy that comes
from the buried remains of plants and animals that lived millions of
years ago (such as oil, coal and natural gas).
Fresh water (n) – water that has a low amount of salt and
minerals.
Freeze (v) – to change a liquid into solid by cooling the
substance.
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