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The third path that the reactive-free radical on the monomer and the free radical itself can take is termination . Combined laser altimetry and SAR imagery and interferometry can show areas of clear-cutting as well as estimates of the rates of regrowth where extensive logging has occurred . The amount and distribution of biomass over the Earth 's land surface is one of the major uncertainties in our ability to understand the global carbon cycle and how it may change in the future ( Post , 1993 ) . Storm surges are an important influence on the near-shore sand budget and can cause large and rapid changes in shoreline . Test your soil for pH and nutrient needs ; professional soil testing may be done through your county extension office .