Mechanical Weathering© Copyright NewPath Learning. All Rights Reserved. 94-4545Visit www.newpathlearning.com for Online Learning Resources.Some photos courtesy of USGS & NPS.Abrasion & Plant GrowthThere are many examples of mechanical weathering of rocks. Abrasion occurs when one rock grinds against another. A rock can also break when plant roots grow into cracks on its surface.abrasiontsExfoliation & Frost WedgingExfoliation is a repeated cycle during which rocks expand in the daytime heat and contract at night, exfoliationfrost wedgingabrasionplant rootsFrost wedgingfreezing and thawing, causing rocks to crack apart.There are many examples of mechanical weathering of rocks. Abrasion occcccccccccccccuuuuuuuuuuuuuuuurrrrrrrrrrrrssssssssssss when one rrrrrrrrrrrrrooooooooooooooooccccccccccccckkkkkkkkkkkkkk grinnnnnnnnnnnnnnnnnnddddddddddddddddddddddssssssssssagainst another. A rock can also break when plant roots grow into cracks ooooooooooooooonnnnnnnnnnnnnnn iiiiiiitttttttttttsssssssssssss ssssssssssssssuuuuuuuuuuuuuurface.Exfoliation is a repeated cycle during whicccchhhhhhhhhhh rrroooooooocccccccckkkkkkkkkkkkkkkkksssssssssss eeeeeeeeeeeeeeeeeeeexxxxxxxxxxxppppppppppppppppaaaaaaaaaaaannnnnnnnnnnnddddddddddddd iiinnnnnnnnnnnnnnn the dddddddddddddddddaaaaaaaaaaaayyyyyyyyyyyytttttttttttttiiiiiiiiiiiimmmmmmmmmmmmmmmmmmmmeeeeeeeeeeeeeeeee hhhhhhhhhhheat and contract at night,exfoliationfrost wedgingabrasionppppppppppppppllllllllllllaaannnnnnnnnnnnnttttttttttttt rooooooooooooooooooooootsFrost wedgggggggggggggggggiiiiiiiiiiiiiiiingggggggggggggggfreezing and thawing, causing rrrrrrooooooooooooooockkkksssssssssssss tttttttttttoooooooooooo cccccccccrrrrrrrrrrrraaaaaaaaaaaaacccccccccckkkkkkkkkkkkkkkkk aaaaaaaaaaaaapppppppppppppppaaaaaaarrrrrrrrrrttttttttttttt.....
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