About one-tenth of Earth's land surface is covered in ice. Built up over thousands of years, most ice occurs in thick ice sheets that cap the land at the North and South Poles. Ice also tops the peaks of high mountains, and rivers of ice called glaciers gouge deep valleys in polar and mountain regions.
No, every Star is unique. With the exception of the Sun, stars are all so far away from Earth that they appear as pinpoints of twinkling light to us. But even though they may look the same to the naked eye, they all have their own characteristics, different in size, temperature, colour, and brightness, depending on how old they are.
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