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B. => Because the oxygen reduces by the increase in altitude... On high mountains the oxygen supply is very low as compared to the plain area...
C. => Because, All materials are made up of atoms and molecules. When molecules get hot they start to vibrate intensely. The vibration causes expansion. Being that there are molecules in the air, now it's easy to understand why air-filled tires expand in the summer.
D. => Because the Thunderstorm lightning may cause the tree to uproot and even you may suffer from high volted electric shot...
The question no . A is not clearly visible .. so I'm sorry ...
cheers !!
C. => Because, All materials are made up of atoms and molecules. When molecules get hot they start to vibrate intensely. The vibration causes expansion. Being that there are molecules in the air, now it's easy to understand why air-filled tires expand in the summer.
D. => Because the Thunderstorm lightning may cause the tree to uproot and even you may suffer from high volted electric shot...
The question no . A is not clearly visible .. so I'm sorry ...
cheers !!
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