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- © 2011 Pearson Education, Inc. Unstable Land Chapter 8
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© 2011 Pearson Education, Inc. Unstable Land Chapter 8
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© 2011 Pearson Education, Inc. Slope Stability Basics Resisting forces oppose gravity and work to maintain slope stability. Slopes become unstable when driving forces >> resisting forces. The driving force—gravity Horizontal surface—gravity’s entire force is directed ┴ surface. Inclined surface—gravity’s force has two components: One component, Gp, acts perpendicular to the slope One component, Gs, acts parallel to the slope If the resistance to gravity’s downslope pull is insufficient, bedrock becomes unstable
