However, volcanoes are essential to earths survival they act like a safety valve for the planet (it releases pressure)
Volcanoes are essentially holes in the earths surface through which magma and lava can erupt. when pressure builds up below the earths crust, magma is then forced violently out of the volcanoes.
The Oceans
Volcanoes
Volcanoes
Volcanoes
Earths interior
Volcanoes are caused by the rising of magma in the earths mantle and earthquakes are caused by the colliding of the earths tectonic plates against one another.
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No, killing the pig is not essential to the survival of the group. There are other ways to obtain food and resources for survival without harming animals.
Reproduction
There are smallamount of volcanoes. They emit so2 and co2 gases.
This is where the weaknesses in the earths crust lie and it is the easiest place for lava to spew out of these weaker areas, therefore forming volcanoes