The Complete Book of 100,000 Reasons Why
lit. ten thousand reasons why
为什么自然界有循环？
1、自然界中的循环是物质和能量的持续流动和转化，这是维持生态平衡和生命活动的基础。
2、水循环通过蒸发、凝结和降水，使水资源在全球范围内不断循环，支持生命生存。
3、碳循环通过植物光合作用、动物呼吸和分解作用，使碳元素在生物圈和大气中保持动态平衡。
4、氮循环通过固氮、硝化和反硝化等过程，使氮元素在土壤和大气中循环，支持植物生长。
5、物质循环如磷循环，通过岩石风化、生物吸收和沉积作用，使磷元素在地球系统中循环。
总之，自然界中的循环是生态系统的基本功能，确保物质和能量的持续利用和再生，维持地球生命的稳定和多样性。
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