Answer: Geographers have divided the study of geography into А. five fundamental regions В. six essential elements C. seven topics D. four key themes
Explanation:
Only three Caribbean countries have oil and natural gas reserves: Barbados, Cuba, and Trinidad and Tobago. Of these, Trinidad and Tobago is the only significant exporter. *Source: Oil and Gas Journal, December 23, 2002. Trinidad and Tobago is the Caribbean's largest producer of oil and gas.
<u>Answer:
</u>
The build-up of three oxygen created our ozone layer around two billion years ago.
<u>Explanation:
</u>
- The ozone layer is a part of the stratosphere which is located right after the troposphere in the atmosphere of the Earth.
- The ozone gas is made up of the abundance of three oxygen molecules combining with the ultraviolet radiation emitted by the Sun.
- The development of the ozone layer happened around two billion years ago when the oxygen concentration levels on the planet began to rise slowly and gradually.
Those geographic helped to protect the Roman Empire.
