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The Harlems effects of Volcanic eruptions are:
1.Kill lots of people.
2.Destroy properties.
3.It can occure an Tsunami.
The Good effects of Volcanic eruptions are:
1.Fertilizes soil.
2.It can make some hot spring.
3.It helps us to know more about lahar and magma.
Hope it helps.:D.
The effect of Volcanic erutions are gives us more infomation about the Volcanoes and it kills lot of lifes.