People can cause earthquakes

Earthquakes are caused by natural forces, but people can bring them on by affecting the outer layer of the Earth's surface. Putting water in the ground for example, can cause tremors. The Kariba Dam, situated across the Zambia-Zimbabwe border, created an enormous lake. As Lake Kariba filled up between 1958 and 1961, the region experienced more than 2000 tremors. They stopped once the reservoir was full. - Violent Planet, ticktock

Earthquakes are caused by natural forces, but people can bring them on by affecting the outer layer of the Earth's surface. Putting water in the ground for example, can cause tremors. The Kariba Dam, situated across the Zambia-Zimbabwe border, created an enormous lake. As Lake Kariba filled up between 1958 and 1961, the region experienced more than 2000 tremors. They stopped once the reservoir was full. - Violent Planet, ticktock

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