Coal seams are far deep underground to be considered for opencast minings. These coal seams require underground mining. Since it is too deep underground, it can be used for mapping and correlation of sedimentary rocks or as a key bed.
1: B
2:D
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~Jarvis
<span>Wide variety of fish species. It always includes this intertidal zone and is
sometimes used to mean the same as the intertidal zone. Though, the meaning of
"littoral zone" can be overall well beyond the intertidal zone. The
littoral zone is the same as a sea, lake or river that is close to the shore.
In coastal environments the littoral zone extends from the high water mark,
which is very rare inundated, to shoreline areas that are permanently submerged.</span>
Honestly, this is supposed to be your opinion, but I will give you mine. I think there should by far be a quality standard, that they should always provide good quality things. It all just depends on what kind of standard they are talking about or what the question is referring to. If there are experiments going on, there should definitely be a certain standard of safety and ensure that the person would come out alive. I hope that this could help a bit, and I apologize if this was not the type of standard in which you were looking for. If you need further help, you can send a DM my way and I will respond when I get the chance. Have an amazing day!