Examlex
_________________ are central nervous system depressants,and they produce loss of sensation,stupor,and unconsciousness.
Scratch Test
A method used in geology to determine the hardness or mineral composition of rock samples by scratching them with a harder material.
Effervescence
The process of releasing gas bubbles from a liquid, often seen when opening carbonated drinks.
Specific Gravity
The ratio of the density of a substance to the density of a reference substance, typically water, at a specified temperature.
Volcanic Glass
A natural glass produced by the cooling and solidification of molten lava at a rate too rapid to permit crystallization.
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