In 1908, in Tunguska,Russia, about 2,150 sq km (830 sq miles) of forest - that's 80 million trees - in Siberia were flattened. No one knows how for sure, But most people now agree that a meteor or comet burst in the air above the Tunguska River.

Deforestaion

The clearing away of trees, known as deforestation, affects our planet in a variety of ways.

• It destorys forest habitsts and kills the animals living there.Two-thirds of all species on Earth need forests for shelter or food.
• The lower number of trees to convert carbon dioxide into oxygen contributes to global warming.
• Trees give off water vapour,so the fewer trees there are, the less water there is in the atmosphere.
• Without tree roots to hold the soil together, there is an increased chance of soil erosion, flooding, and landslides.

Types of Forest...

• RainForest

      Lush tropical forests are found in hot regions with high rainfall,usually around the tropics of Cancer and Capricorn.

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

• Tropical Dry Forest  

Vegetation that can survive the long, parched months of a dry season grow in these forests.   



::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

• Coniferous Forest
  

Vast areas of coniferous forest stretch across the cold regions of North America,Northern Europe,and Asia.



::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

• Temperate Forest

In areas with distinct cool and warm seasons grow broadleaved
trees that lose their leaves in
the winter months.

How Many Trees Makes a Forest?

The definition of a forest varies around the world,but

the main characteristics are the same - it is an region

that is densely planted with tall trees, and covers a

large area. More than 50 percent of Earth's animal and plant species can be found here.