北師大版高中英語(yǔ)選修八unit22environmentalprotectiontheeleventhperiod教案-在線瀏覽
2025-01-21 18:56本頁(yè)面
【正文】 owing on the PowerPoint.) Teacher asks the questions, students read the materials together. What is a Rainforest? Rainforests are very dense, warm, wet forests. They are havens (安身之處 ) for millions of plants and animals. Rainforests are extremely important in the ecology of the Earth. The plants of the rainforest generate much of the Earth39。s oxygen. These plants are also very important to people in other ways。 F and 80176。 C). Temperate rainforests rarely freeze or get over 80176。 C). The Soil in a Rainforest The soil of a tropical rainforest is only about 34 inches ( cm) thick and is ancient. Thick clay lies underneath the soil. Once damaged, the soil of a tropical rainforest takes many years to recover. Temperate rainforests have soil that is richer in nutrients, relatively young and less prone to damage. The Importance of Rainforests Tropical rainforests cover about 7% of the Earth39。s ecosystem. The rainforests recycle and clean water. Tropical rainforest trees and plants also remove carbon dioxide from the atmosphere and store it in their roots, stems, leaves, and branches. Rainforests affect the greenhouse effect, which traps heat inside the Earth39。 they get their food by hunting for meat (and fishing for fish) and gathering edible plants, like starchy roots and fruit. Many also have small gardens in cleared areas of the forest. Since the soil in the rainforest is so poor, the garden are
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