The Ozone layer is the the atmospheric region called the stratosphere, and shields us from harmful ultraviolet B radiation that comes from the sun.
Which are best answers?
No - Ozone holes can be hole-shaped. - Actually the ozone holes are not actually holes, but an area where the ozone has been depleted or thinned.
Yes - Ozone holes allow ultraviolet light to reach the Earth's surface. - When ozone levels decrease, it allows UVB radiation to pass through and our surface is exposed.
No- Ozone holes don't have any ozone in them. - Ozone holes have lower levels of ozone in that area of the stratosphere.
Yes - Chlorofluorocarbons make an ozone hole larger. This is called the greenhouse effect. When we warm the earth's surface with these types of gases, they can trap energy from the sun. This makes it warmer on earth's surface. There has been a scientific link between CFC gasses and ozone depletion.
Yes - There is always just one ozone hole in the Earth's atmosphere. - The ozone hole forms over Antarctica because its winter allows the atmosphere to get cold enough for nacreous clouds to form in the ozone layer.
No - Ozone holes have more ozone than usual. - Ozone holes are areas where the ozone levels are depleted.
Answer:
More than two and a half years, is the right answer.
Explanation:
The First World War began in the year 1914 in Europe. As many of the Americans wanted to stay out of the conflict so they supported the policy of strict and impartial neutrality announced by Woodrow Wilson, the then President of the United States. However, the United States engaged in the war due to the German policy of waging unlimited submarine warfare which resulted in the sinking of American ships. The Zimmerman Telegram was the recent cause of America's entry in the war.
The gross domestic product<span> (</span>GDP<span>) is one of the primary indicators used to gauge the health of a country's economy. It </span>represents<span> the total dollar value of all goods and services produced over a specific time period; you </span>can<span> think of it as the size of the economy</span>
Narcolepsy is characterized by "sleep attacks" , which are intrusions of elements of REM sleep into periods of wakefulness. In narcolepsy urgent sleep usually begins almost immediately after the onset of the attack.
<span>Treatment includes regimented sleeping schedule with frequent naps, and drug therapy, such as modafinil.</span>
