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Zara

Ozone hole refers to

A. hole in ozone layer
B. decrease in the ozone layer in troposphere
C. decrease in thickness of ozone layer in stratosphere
D. increase in the thickness of ozone layer in troposphere

Option: C

A black hole is a ________

A. Contracted star with intense gravitational pull
B. Star with very low surface temperature
C. Star with no atmosphere
D. Pulsating star

Option: A