Amazon Rainforest：亚马逊热带雨林.ppt

Geography ProjectAmazon Rainforest By Cornelie Jacobson 8/7 Index Rainforests I Rainforests II Rainforests III Layout People living there Plants Animals I Animals II Cutting down Rainforests I Tropical rainforests are usually found north of the Tropic of Capricorn and around the Equator The temperature varies from just under to over 30 degrees Celsius during the year. Tropical rainforests have quite a lot of rain throughout the year. About 200mm on average. Rainforests are commonly classified by climate, altitude, and latitude, either alone or in combination. The phrase Equatorial Rainforest refers to forests found in the equatorial zone 10° either side of the Equator; in some cases the rainforest extends beyond the Tropics, where it is called Subtropical Rainforest. In areas that experience pronounced changes in season (a cycle of wet and dry seasons), the forests are classified as monsoon rain forests. Rainforest can also establish itself on tropical mountains. Rainforests II The Amazon rainforests are on the east coast of Brazil in Peru, it is almost thirty times the size of Great Britain. The term rainforest has also been used to describe some temperate communities, such as the northwest coastal coniferous forest of North America, where rainfall and humidity are high and winters mild. Vertical stratification of trees and plants is a characteristic feature of rainforests. Tropical soils are generally diverse, ranging from volcanic to almost pure quartz sands. Sometimes one to a half of the total rain forest area is composed of reddish latosols (soils from which the nutrients have been stripped). Rainforests III The forest floor is dark and it is difficult to spot the animals. The plants in the rainforest need light, water and warmth to survive. The rainforest gets about 200mm of rain a year and one of the hottest daily temperatures, 25 degrees Celsius. The warm air rises which causes low pressure over the Atlantic ocean and it rains. During the day clouds bu