Physics
Which one of the following is used for sun glasses ?

Crooks glass
Flint glass
Pyrex glass
Crystal glass

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Physics
Air moves from the region where the air ________

Humidity is high to the region where the humidity is low
Pressure is high to the region where the pressure is low
Pressure is low to the region where the pressure is high
Humidity is low to the region where the humidity is high

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