C= Geography
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Precambrian rocks<span> are mostly covered by rock systems of more recent origin, but where visible they commonly display evidence of having been altered by intense </span>metamorphism<span>. Precambrian rocks often occur in shields, which are large areas of relatively low elevation that form parts of continental masses.</span>
Answer:
Fewer methamphetamine labs are being operated and/or discovered in the United States.
Explanation:
Although it is difficult to establish a definite conclusion without more information, from what we do know there are few seizures of methamphetamine labs. This could be due to a reduced presence of attempted seizures, to an overall decrease in the number of labs, to more efficient means of hiding the labs from the authorities or to the increased importation of finished products from other countries.
The air behind the front is cooler than the air it is replacing and the warm air is forced to rise, so it cools. As the cooler air cannot hold as much moisture as warm air, clouds form and rain occurs.