I think it’s Magma generated by the hotspot rises through the rising plates of the lithosphere and produces active volcanos.
The correct answer should be D) competition for jobs from a large wave of European immigrants
Unemployment was already a problem and a large number of immigrants certainly didn't help.
Answer: the answer is B
Explanation: where Gabbro is a plutonic rock that cools slowly at depth basalt is a volcanic rock , fine grained and cools rapidly on earth Surface , but they both contain abundant dark coloured feromagnesia minerals.
Answer:
they represent angular distance north and south of the equator