Before revision: The Urals between eastern Europe and Siberia have a similar importance in terms of mining and the economy; and the extent of these mountains in Russia, which are up to 1,900 metres high, is similar to that of the Appalachians
After revision: .The Urals between eastern Europe and Siberia have a similar importance in terms of mining and the economy; and the extent of these mountains in Russia, which are up to 1,900 metres high, is similar to that of the Appalachians