Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by
strong ultraviolet radiation, release chlorine atoms, and then react with ozone molecules
. See Ozone Depleting Substance
What destroyed the ozone layer?
Chlorofluorocarbons (CFCs)
are a class of chemical refrigerants that destroy the ozone layer and warm our planet. They are both ozone depleting substances (ODS) and potent greenhouse gases (GHGs).
Why are CFCs so destructive?
CFCs can
only be destroyed by extremely energetic ultraviolet radiation
, such as is found above most of the ozone layer. … The photolysis of CFCs generates a highly reactive chlorine atom that can attack ozone or form compounds that destroy ozone.
What gas makes up 21%?
It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent
oxygen
.
Is there still a hole in the ozone layer 2020?
The record-breaking
2020 Antarctic ozone hole finally closed at the end of December
after an exceptional season due to naturally occurring meteorological conditions and the continued presence of ozone depleting substances in the atmosphere.
What is the most abundant gas in the universe?
Hydrogen
is the most abundant element in the universe, accounting for about 75 percent of its normal matter, and was created in the Big Bang. Helium is an element, usually in the form of a gas, that consists of a nucleus of two protons and two neutrons surrounded by two electrons.
What air is made of?
Standard Dry Air is made up of
nitrogen, oxygen, argon, carbon dioxide, neon, helium, krypton, hydrogen, and xenon
. It does not include water vapor because the amount of vapor changes based on humidity and temperature.
Which gas is used in protein synthesis?
Nitrogen
is the gas which is used in protein systhesis. There are majorly two processes which are involved in the synthesis of protein.
How big was the ozone hole in 1985?
The maximum depth of the hole that year was 194 Dobson Units (DU)—not far below the previous historical low. For several years, the minimum concentrations stayed in the 190s, but then the minimums rapidly grew deeper: 173 DU in 1982, 154 in 1983,
124
in 1985.
Is the ozone hole permanent?
Scientists have found evidence that the hole in the ozone layer over
Antarctica is finally beginning to heal
. If progress continues, it should be closed permanently by 2050.
How large is the ozone hole now?
This year, the ozone hole already covers an area of
8.5 to 8.8 million square miles
(22 to 23 million square km), just 700,000 square miles (2 million square km) short of the 2006 record level of 9.7 million square miles (25 million square km).
What is the rarest element in the universe?
Astatine
What is the 2nd most abundant element on Earth?
| Z Element Mass fraction (ppm) | 1 Hydrogen 739,000 | 2 Helium 240,000 | 8 Oxygen 10,400 | 6 Carbon 4,600 |
|---|
Why is there so much hydrogen in the universe?
Hydrogen atoms are just protons
. Protons are the only stable composite particles that can be formed from quarks. So once the early universe is cold enough for quarks to get into bound states, you end up with lots of protons, i.e., lots of hydrogen.
Can you breathe pure oxygen?
Oxygen radicals harm the fats, protein and DNA in your body. This damages your eyes so you can't see properly, and your lungs, so you can't breathe normally. So
breathing pure oxygen is quite dangerous
.
Why the air is invisible?
Air looks
invisible because it sends very little color to our eyes
. … Air is a mixture of gases, mainly nitrogen and oxygen, with small molecules that are far apart. Wavelengths of light may pass by these molecules without hitting them.
