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A simple Mogi ( point-source ) model for volcanic deformation , showing displacement rate vs. horizontal distance from the center of deformation . The fungus establishes itself in the petals . The term itself means ' swelling ' , which describes its initial stages . Although it may be difficult to make yourself remove fruit , the quality of the apples or pears you will harvest in the fall will be greatly improved by thinning . Once the tree has rough and flaky mature bark , neither winter sun nor chewing animals can harm it , so tree guards will not be necessary . Neither the synoptic view nor controlled geometry of a space platform are attainable by airborne or ground techniques , while problems of air space restrictions disappear with a space platform . Mojave Desert that required only two satellite passes ( one before , one after ) to measure coseismic offset . Together , elevation , slope , and aspect ( north vs. south facing ) exert enormous control on surface hydrology and ecosystems .