求翻译：地球物理勘探主要包括重力勘探、磁法勘探、电法勘探（包括电磁法）及地震勘探。这几种方法都是以岩矿石的物性差异（如密度、磁化强度、电阻率、地震波速差异）为基础，用专用的仪器观测和研究天然存在或人工形成的物理场的变化规律，进而查明地下构造、寻找矿产资源和解决工程地质问题。是什么意思？

Geophysical gravity prospecting, magnetic prospecting electrical prospecting (including electromagnetic), and seismic exploration. These methods are based on the physical properties of rocks and minerals difference (such as density, magnetization, electrical resistivity, seismic velocity differences

geophysical exploration for exploration include gravity, magnetic, and electric oil exploration (including law electromagnetic laws) and seismic exploration. Several of these methods is to the physical properties of rocks minerals (such as density, magnetization, resistivity, and seismic wave speed

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The geophysical prospecting mainly includes the gravitational exploration, the magnetic prospecting, the electrical prospecting (including electric-magnetic method) and the seismic survey.These methods all are take the crag ore natural difference (for example density, magnetization, electronic resis