Ethnicity can be simply described as a person's identification in related to a certain group of peoples with a certain value system, culture and language.
In this case, all, the speaking language, cultural traditions and the shared common history identifies one group of people from another.
D. The filling and swelling of the magma chambers below the crater on the island of hawaii.
Explanation:
The magma chambers is a large pool of liquid rocks that are found beneath the surface of the earth and such a chamber is formed under great pressure and this pressure gradually fractures the rocks around it.