The Earth beneath our feet seems reassuringly solid and unchanging most of the time. But this is an illusion, born of our limited perspective.

Our planet rotates on its axis once every 23 hours, 56 minutes and 4 seconds. It also orbits the Sun, while our Solar System dashes around the centre of the Milky Way, which is itself hurtling across the Universe towards a region of space called the Great Attractor. The speeds involved are frankly dizzying.

Even if you ignore all that, the Earth is far from stable. Beneath us, enormous chunks of rock are constantly grinding past each other to make valleys, pushing together to form mountains, or dragging apart to create rivers and oceans. The ground under us is forever shifting, stretching and wobbling.

Most of the time, this is nothing to worry about. However, our growing understanding of these phenomena is driving a better understanding of the inner workings of our planet. It is also handy for anyone trying to track and land spacecraft. Here, then, are seven things that make the Earth move for us.

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