<u>Answer:
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The build-up of three oxygen created our ozone layer around two billion years ago.
<u>Explanation:
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- 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. Clay soil has a higher porosity than sandy soil.
Explanation:
Maller soil particles have smaller pore spaces, but a greater number of them, which leads to higher surface tension and high % porosity.
The most densley populated region of england is the southwest region and this is because all the main big cities are in the south the southwest area. Not only is this a popular spot for tourist because of all the cities but also because it has the main amount of middle to lower class houseing in England.
The Strait of Hormuz is a Choke point that is used to monitor exports and imports leaving in the Middle East
