地球的形状是圆的,环绕地球外面那个有生命的部分,为地球形成了一个外套,叫做生物圈。生物的生存需要依靠一定的物质条件,如阳光、温度、水、土、气等,都是不可缺少的生活因素。地球上的全部生命所依赖釣能源是太阳,目前太阳辐射的能量只是靠具有叶绿素的植物进行光合作用产生有机物而进入生物循环。因此,凡有阳光照射 The shape of the earth is round, surrounding the living part of the Earth, forming a coat for the Earth called the Biosphere. Biological survival depends on certain material conditions, such as sunlight, temperature, water, soil, gas, etc., are indispensable to life factors. All life on Earth depends on fishing for the sun, and the energy of solar radiation now relies on the photosynthesis of chlorophyll-producing organisms to enter the biological cycle. Therefore, where there is sun exposure