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An unread, unused copy: no writing or highlighting, and no missing or damaged pages. Every book we sell is brand new, including our lowest-priced titles.
Mountains seem like they have been in place forever, and it can be difficult for kids to imagine how mountains were built over millions of years by processes continuing today. To make a mountain range, the Earth's tectonic plates rub against or crash into each other. Kids will be interested to learn that something as seemingly steadfast as mountains can be built, and eroded away.