Russia's vast geography is an important determinant of its economic activity, with some sources estimating that Russia contains over 30 percent of the world's natural resources.[28][29][30] The World Bank estimates the total value of Russia's natural resources at $75 trillion US dollars.[31][32] Russia relies on energy revenues to drive most of its growth. Russia has an abundance of oil, natural gas and precious metals, which make up a major share of Russia's exports.