Helsinki is located on the Baltic Sea
Tides have an effect on the waves and the moon has to do with both.
Answer:
The 12 survivors are people who are married (6 couples), the word "single" is the keyword denoting those only people who are single had died.
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.