Natural resources are those grown or acquired through nature without any involvement of people. Usually natural resources grow on their own and will reproduce or continue again to occur. Most common natural resources are water and sunlight. Other natural resources include crops that can be reproduced.
Sometimes, like water, we don’t have access to it at all times. You will have to wait for it. Rain and sunlight take place on its own accord. Growing food as crops can be more controlled in that people can plant and harvest them when they like. Some other natural resources like oil and coal occur in nature, but once they are taken, they are gone. There are only so many natural resources like coal and oil that can’t be renewed like other resources.