could build the side walls of the castle? Could they make a steeper wall if the sand was dampened? Questions like these go well beyond the playground or beach. Many people have been killed by the collapse of unstable slopes of loose rock or sand.
This ELI investigates the factors which affect the angle at which loose materials rest before they begin to slide.
This is one of many activities in our Earth energy/processes category. Activities relating to landslides can be found in Natural hazards.
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