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Subjects
Science State Board
Class 8
Changes around us
Effects and indicators of chemical change
7.
Greenhouse effect and ozone layer: choose the correct option
Exercise condition:
3
m.
1
.
___________ causes an increase in sea levels due to melting of ice glaciers.
Coal
ONGC
Global warming
2
.
Dark in colour and cooler region of the sun is known as __________, which is the natural phenomena for ozone depletion.
Metals
Sun-spots
None of these
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