Challenger App
Home
Exams
Questions
Notes
Blog
Contact Us
e-Book
×
Home
Exams
▼
Questions
Notes
Blog
Contact Us
e-Book
Home
/
Questions
/
പരിസ്ഥിതി
/
പരിസ്ഥിതി പ്രശ്നങ്ങൾ
No.1 PSC Learning App
★
★
★
★
★
1M+ Downloads
Get App
Ozone layer was discovered in?
A
1920
B
1913
C
1912
D
1915
Answer:
B. 1913
Related Questions:
In today's scenario, which change seen in human attitude has helped in decreasing the production of non-biodegradable waste to some extent?
What does the fertilizers and farm animal waste cause?
The Chernobyl nuclear incident happened in Russia in the year of?
Which of the following agents is responsible for turning the Taj Mahal yellow?
Three of the following statements pertaining to non-biodegradable plastics indicate their implications on animals, plants and our surrounding. Choose the odd one out?