Forests are divided into three different layers: the forest floor, the understory and the canopy. The forest floor is comprised of soil, dead plants and animals and small plants such as grasses and wildflowers. The understory contains small trees or bushes and is also called the shrub layer. The canopy is made up of the leaves and branches of the trees that dominate the forest.
Besides providing us with the life-giving oxygen, Earth’s atmosphere is our protective blanket. It is the buffer that burns up most meteors away. It is a screen from deadly cosmic radiation. Also, it is the reason why we can communicate via radio waves because it bounces the waves for long distances around the globe. The air that accomplishes all of this is composed of five major layers.