Deforestation has a negative impact on the environment.
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Human activity increases the greenhouse effect and leads to global warming.
The layers of different types of forests may vary.
Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.
Carbon is bound in organic substances during photosynthesis, while during breathing, it is released into the atmosphere.
The dodo is an extinct species of birds that used to be native to the island of Mauritius. It has become the symbol of extinction.
Giant sequoias are the world's largest living organisms by mass.
Paper was invented more than two thousand years ago.
Pollution is the detrimental effect of human activity on the natural environment.
One of the most common tree of the pine family, native to Eurasia.
Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.
This animation demonstrates different types of soil.
This animation demonstrates the main sources of air pollution: agriculture, industry and urban settlements.