Text complete: '' i 'm not familiar with that location , where exactly is that ? '' his teacher asked . '' it 's in the northwestern portion of the mojave desert , '' matt replied . '' what prompted you to go way down there ? '' mr. swartz asked . '' my friends and i were studying the timbisha petroglyphs for our anthropology class . the rock caught my eye because it was an erratic , but i 'm still not sure what geological mechanism placed it in the
desert