Magnetic storms also heat the upper atmosphere, changing its density and composition and disrupting radio communications and GPS units.
磁暴还会对高层大气存在加热作用，改变其密度计组成，中断无线电通信与GPS装置。
In the crust and upper mantle, the density is characterized by lateral and vertical heterogeneity.
地壳上地幔密度不均匀性特征在纵向和横向上都是很明显的。
Percentage, relative density and importance values of tree species and intolerant tree and shrub species increased while slope gradient from lower to upper.
灌木层中乔木树种和阳性乔灌木种类比例、相对密度和重要值均随坡位梯度从下部到上部逐渐增大。
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