Answer:
do u mean pentagon from 9/11
Explanation:
there was no hexagon
The Nile river is the longest river in the world, followed by the Amazon river which is the second longest.
Human and physical (look up the definition.)
Answer:
Quartz is not pure in this rock.
Explanation:
When quartz shows effervescence in contact with an acid, it means that it is not in its pure state, but rather related to other substances that may be cementing the quartz. This effectiveness is caused by substances that do not react like quartz, such as calcite.
In this case, we can conclude that in relation to the calcium-rich rock shown in the question above, the calcium is not pure, but it is likely to be related to calcite, or other material that does not react to acid.
<span>limestone is a hard sedimentary rock, made mostly of calcium carbonate or
dolomite, and it's used as building material & in the making of cement.</span>
