http://www-tc.pbs.org/wgbh/nova/sciencenow/3214/images/02-vari-volcanic.jpg

http://www.skepticalscience.com/images/CO2_vs_Volcano.gif

 What is the "Ring of Fire"?

The ring of fire is where a lot of volcanoes and earthquakes usually occur. It is located in the pacific ocean and the home of many volcanoes and most of them are active. The only reason there are lots of volcanoes is because tectonic plates. They spread apart or combine to form them like mountains. They are all on the continents that are touching the Pacific Ocean. Even Hawaii was made from volcano eruption. However not all volcanoes are made in the Pacific Ocean and plate tectonics, like the one in Iceland which is in the Atlantic Ocean. Some are dangerous, but others are not even active. Anyways if you want to see volcanoes then visit the "Ring of Fire."

Do volcano eruptions cause harm to the Earth? Q. #2

 Yes, volcanoes do cause harm to the Earth . First of all when they erupt it causes lava and hot magma to shoot out and burns and destroys everything in its way like trees, houses, plant life and the homes of the creatures that used to live there. It ruins any fertile farm land so nothing would grow because the lava hardens on top of the ground. The volcano also emits ash and lots of gases into the atmosphere to block out the sun and keep the harmful gases in and cause the Earth to be really warm  or really cold because all the ash is blocking the atmosphere, so nothing can go in or out. The sun won't be able to heat the earth so it will be really cold like the first ice age. But if  the volcano did all that then it should have been a massive volcano eruption, sometimes volcanoes don't cause a lot of damage at all some just leak out lava for a long time like the Kilauea Volcano in Hawaii.  Volcanoes also delay things or stop things that are going on like the one that erupted in Iceland and closed lots of airports. Some volcanoes don't erupt for a long time ,but they could still erupt ,and some don't even function anymore.

What are volcanoes and what causes them erupt?

 

  Volcanoes are formed when plate tectonics go above one another and causes hot magma to rise. If they are tall then it must have erupted a lot  to rise higher. Volcanoes are usually cone shaped and look like mountains. The buoyancy and  pressure of the gases inside the Earth cause the volcanoes to erupt shooting out lots of magma and ash out of the top of them. There are three types of volcanoes ;the shield volcano which are the largest volcanoes; the cinder volcano are the most common kind of volcano; and the stratovolcano is tall and also called the composite volcano. The worst volcano is a super volcano which has been theorized to have caused a mass extinction.

en.wikipedia.org/wiki/Supervolcano volcano.oregonstate.edu/education/vwlessons/lessons/lesson6.html

http://sarafryd.files.wordpress.com/2009/09/volcanoes-erupting.jpg