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Word Count: 335
Having just been notified that the PTO will grant my request to fund the building of a statute of my favorite teacher I am left with the task of selecting which type of rock I will use I will have to take into account how climate physical weathering chemical weathering and biological weathering will affect my statue I have a choice of many types of rocks to choose from including marble granite rock salt chalk limestone and sandstone I can easily eliminated rock salt and chalk because of how easily they erode Rock salt when exposed to water will start weathering immediately and chalk likewise I cant use sandstone either because it easily erodes when in contact with wind and rain Physical weathering does too much damage to these rocks After eliminating the above rocks I am left with limestone granite and marble I wont be able to use limestone either because it is very fragile when exposed to acid rain No matter how rare it occurs acid rain can cause a lot cracks and crevices to form Later when water freezes in the cracks ice wedging can cause the statue to just fall apart For this reason I cannot use limestone either Now I am left with marble and granite Of these left I will choose granite because it is harder than marble Granite and marble are similar but since granite is igneous rock it is harder Being harder or denser has many advantages The harder the rock is the tougher it will be to weather away Since the statue will be in the Butterfly Garden it is also in danger of biological weathering The plant roots all around the statue will grow into any little crevice and expand So the harder the rock is the longer it will take to weather Therefore for the statue I have chosen to use granite Using granite will insure that my statue will
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