Natural resources  are the useful things that occur (36) _________ in the environment. Some examples are oil, water and trees. Humans use natural resources for every part of their lives, so we all must be careful to use them wisely.

Resources can be divided (37) _________ renewable and non-renewable resources. The difference is whether the resources recovers naturally over time. Renewable resources are usually living things like animals or plants. For example, trees are a renewable resource because they grow again soon after we cut them down. But oil is a non-renewable resource because it takes millions of years (38) _________ again. We must try to save the non-renewable resources because once they are used up, we cannot get more.

Natural resources can be traded between countries. They can create (39) ________ wealth for resource- rich countries. For example, Saudi Arabia, Iran, and Kuwait in the Middle East have a large amount of petroleum. They (40) _________ it to other countries and make good money.

Read the following page and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

Natural resources  are the useful things that occur (36) _________ in the environment.