Lots of natural factors change the face &structure of the earth like earthquakes, volcanoes, hurricans, rain etc. Such changes give birth to new lands, rivers mountains , rocks &stones.
很多自然因素改变着地球的地表形态和地质构造，如地震、火山、飓风、雨水等。
Magnetotelluric (MT) sounding is an important geophysical means to study the Earth electrical structure using the natural EM field as its source.
大地电磁测深法(MT)是以天然电磁场为场源研究地球内部电性结构的一种重要的地球物理手段。
Highway subgrade is soil body structure including natural earth foundation and artificial fill embankment.
公路路基是土体构筑物，含天然土地基和人工填土路堤两大部分。
应用推荐