Quicksand exhibits the same property but to a much more pronounced extent. If you stand with your feet planted in one spot near the surf zone and move your body around the change in the center of gravity of your body's mass will apply shear force to the seemingly solid sand and your feet will sink a small amount into the sand. The amount of water in the sand determines how much like a liquid the sand-water mixture will act.
it looks like a solid but acts like a liquid when stress is applied. (That means the force necessary to slide the sand grains against each other becomes very low.) The sand and water mixture is thixotropic. Hey! I know this one! Quicksand is sand with a high enough water content that separates the sand grains enough to allow shear modulus 1 to become quite low.
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