<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.
C. South Africa goes through another economic recession
By looking at all of the topographic maps given, the profile that best shows the topography along the line AD is going to be the first graph. This is the one that shows the best contour line elevations that are in feet. <span />
It is the Tigris River. The Tigris river is located at Asia. It is one of the major rivers in Asia.
The correct answer for the question that is being presented above is this one: "TRUE." <span>Swamps can occur seasonally. The statement is true because swamps are not naturally formed. It is caused because water are stock for a longer time in a certain place and was collected there.</span>
