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Dwarfing and Standard Rootstocks When purchasing an apple or pear tree , one is actually selecting a plant made up of two genetically different individuals grafted together , the " scion " and the " rootstock ” ( Figure 1 ) . Successive SAR images in urban areas over periods of several months may be able to detect subsidence directly . Data with a horizontal resolution of better than 500 m are publicly available for only 10 percent of the global land surface . Much of this variation can be attributed to the fact that average elevation is only a poor proxy for the way topography controls the erosion rate . We explore some aspects of the cultural output of children of migrants in France ( film , literature and music ) .