Question What is the primary role water plays in triggering landslides? The added weight of water to a hillslope during heavy rains is a common landslide trigger Landslides are most commonly caused when water in a river erodes a hillslope from below, making it unstable. Water increases the coherence of materials, making landslides less likely. Water reduces the friction between rock layers, lowering the necessary energy input from a landslide trigger to cause a slide.
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