Incomplete question. The Options read;
a) Is about one-hundred-million years old.
b) Is 4.6 billion years old.
c) Has been here forever.
d) Is less than about one-hundred-million years old.
e) Is more than about one-hundred-million years old.
Answer:
e) Is more than about one-hundred-million years old.
Explanation:
<em>Remember, </em>we are talking about the information available some two to three hundred years ago when there was no modern geological equipment for radioactive elements tracing.
Hence, using uniformitarian calculations from the thickness of known sedimentary rocks, <u>the geologists concluded that the Earth must be more than about one-hundred-million years old.</u> However, modern researchers today have concluded the Earth to be <u>not </u>millions but billions of years old.
<span>C) equal to the revolution period around Earth
</span>
The United States hasn’t really asked for much recently from other countries do to food, financial problems, or medical assistance because we haven’t been impacted by something like that in a while. We haven’t had disasters where we’ve had to ask other countries because everyone helps everyone
Answer:
yoo you get my e m a i l?
Explanation:
Ozone layer depletion was not noticed until 1979, while CFC’s have been around since 1920s because CFCs take time to enter the stratosphere and remain there for at least 60 years after their initial release.
Option: A
Explanation:
Ozone layer is found in stratosphere. Ozone plays a dual role in the environment. When it is in the ground surface zone it is a harmful gas but when its in the atmosphere it is a life saving layer which absorbs UV rays and protect human beings and animals from the harmful affect of poisonous gases.
Though ozone layer started depleting from 1920. But it came into notice from 1979 as CFCs take time to enter the stratosphere and remain there for at least 60 years after their initial release.
