Question

What causes landslides ? How are river block dangerous ?​

Answer 1

Answer:

landslide dam occurs when a landslide has blocked a river or stream, causing water to build up behind it. This causes flooding upstream and a drought or decreased water flow downstream. Landslide dams can be extremely dangerous because they are usually highly unstable.

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Answer 2

Answer:

landslide are caused by heavy rain.

and also by cutting down tree