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The Natural Resources Protection(II)

Land resource protection Land is a place where human beings live and produce. It is a highly integrated natural economic system composed of many factors such as geology, geomorphology, climate, vegetation, soil, hydrology and human activities. From the perspective of ecological balance, controlling population growth and strictly restricting the occupation of cultivated land are closely …

Natural Phenomena- Thunder(II)

The condition for generating lightning is the accumulation and polarity in the thundercloud. Scientists have carried out a large number of observations and experiments on the lightning mechanism and charge distribution of thunder-cloud. They have accumulated a lot of information and put forward various explanations. Some arguments still have debates. “Ion flow” hypothesis in the …

Nature Wonders of the World(Ⅰ)

Colorado, the Grand Canyon The Grand Canyon of Colorado is a world-famous natural wonder. It is called as the biggest fissure on the earth and located on the Kaibab Plateau in the northwestern part of Arizona. The Grand Canyon is 446 kilometers long, with an average width of 16 kilometers, a maximum depth of 1,740 …