Different types of forests are found across the planet. In one area, a forest may be dry with little vegetation. In another, a forest may contain large trees that grow quickly because of high precipitation and fertile soil. Different types of forests exist because they grow under different climates. These different climates result in different ecological zones, or ecozones. Another reason different types of forests exist is that human activities have changed some of the forests. These activities Topics: Active Forest Management, Engineering and Forest Products, Wilderness, Climate, Ecozones, Elevation, Forest Inventory, Forest Loss.