<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.
Answer:
20-30 feet (6-9 metre) in Japan
Answer:
Alleghenies, White Mountains, Green Mountains, Catskills
Explanation:
I feel like this is right. Sorry if I'm wrong.
Answer:
Wetlands.
Explanation:
An area of land that is covered with a shallow layer of water during some or all of the year.
Transform/conservative plate boundary.
hope it helps c:
