MCQ
Earth is protected from $UV-$radiations by:
- ✓Ozone layer
- BNitrogen layer
- CCarbon dioxide
- DOxygen layer
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|
Substance
|
Boiling Point $(^\circ C)$
|
Melting Point $(^\circ C$)
|
|
$A$
|
$-183$
|
$-219$
|
|
$B$
|
$445$
|
$119$
|
|
$C$
|
$78$
|
$-15$
|