Which of the following are beneficial products of volcanic activity?

answer:

A volcano is formed by eruptions of lava and ash. Volcanoes are usually cone shaped mountains or hills. When magma reaches the Earth's surface it is called lava. When the lava cools, it forms rock

Explanation:

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answer:

the Hawaiian Islands

geothermal energy

sills

Explanation:

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answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.