![subject](/tpl/images/cats/himiya.png)
The Montreal Protocol limited the world’s use of chemicals like Chlorofluorocarbons (CFCs). Which sentence best indicates that the Montreal Protocol led to improvements in the thickness of the ozone layer? When ozone was first measured by satellite in 1979, the average concentration above Antarctica was 225 Dobson units (DU). In 1989, when the Montreal Protocol took effect, it was 127 DU. The lowest level was 92 DU in 1994.By 2019, the value was back up to 167 DU. Excerpt courtesy of NASA
![ansver](/tpl/images/cats/User.png)
Answers: 1
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 21.06.2019 22:00
Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.
Answers: 2
![question](/tpl/images/cats/himiya.png)
Chemistry, 21.06.2019 23:00
An electrons position cannot be known precisely only it's probability of being in a certain location can be known
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 06:00
When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?
Answers: 3
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 16:30
How many moles of sulfuric acid (h2so4) are needed to react completely with 6.8 moles of lithium hydroxide (lioh)? 2lioh + h2so4 → li2so4 + 2h2o a. 3.4 mol h2so4b. 6.8 mol h2so4 c. 10.2 mol h2so4 d. 13.6 mol h2so4
Answers: 3
You know the right answer?
The Montreal Protocol limited the world’s use of chemicals like Chlorofluorocarbons (CFCs). Which se...
Questions
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 03.08.2019 12:40
![question](/tpl/images/cats/es.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
History, 03.08.2019 12:40
![question](/tpl/images/cats/geografiya.png)
Geography, 03.08.2019 12:40
![question](/tpl/images/cats/mat.png)
Mathematics, 03.08.2019 12:40
![question](/tpl/images/cats/biologiya.png)
Biology, 03.08.2019 12:40
![question](/tpl/images/cats/fizika.png)
Physics, 03.08.2019 12:40
![question](/tpl/images/cats/biologiya.png)
Biology, 03.08.2019 12:40
![question](/tpl/images/cats/istoriya.png)
History, 03.08.2019 12:40
![question](/tpl/images/cats/health.png)
Health, 03.08.2019 12:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/health.png)
Health, 03.08.2019 12:40
![question](/tpl/images/cats/en.png)
English, 03.08.2019 12:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/geografiya.png)
![question](/tpl/images/cats/health.png)
Health, 03.08.2019 12:40