According to the online content article on the formation of mountains, the world’s tallest mountain ranges, such as the Himalayas, were formed when __________.

The Himalayas formed where the Indian tectonic plate collided with the Eurasian plate. When large pieces of Earth’s crust collide, the crust is compressed and pushed upward, creating tall mountain ranges. So the best answer is “large pieces of the Earth’s crust collided.”

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