Earth Today

Page 8

Surtseyan

b) The strongest volcanoes are:  Phreatomagmatic eruptions  Phreatic eruption  Pelean eruptions  Plinian eruptions  Ultra Pilnian  Phreatic eruptions

Volcanoes have different materials: Lava: is only a part of the hazards created by volcanoes. Lava flows are usually slow and therefore, people can easily escape them. But, they can cause extensive economic loss by burning and crops. Gas: volcanic eruptions usually contain a number of harmful gases like carbon dioxide, sulfur dioxide, water vapor, etc. That can create a lot of changes in the Earth's atmosphere. Ash: volcanic ash mainly consists of small and sharp rock particles formed from the breakdown of magma. The explosive eruptions of volcanoes can throw such ash particles over a long distance.

ISSBN 338-89-1996 © Marc and Alice 2011

Joan Oró Publishers Ltd

8


Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.