How do natural resources have an effect on a country's economy? Explain in 2 to 3 sentences!

Natural resources can change a nations economy, just by being there for harvest. Let’s take Saudi Arabia, a land filled with oil and primarily they’re economy, they sell lots of oil but are unable to gather other supplies necessary for a nation. A country needs a amalgamation of different resources to prosper and do well, because they need to keep a nation healthy.