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geo volcanoes
| Question | Answer |
|---|---|
| a volcano | a moutain formed by the eruption of magma on the earths surface though a hole or vent in the earsths crust |
| lava | once the magma reache the surface it is now known as lava |
| basalt rock | lava cools quickly to form basalt rock |
| composite volcano | high silica content results in violent eruption. cause mountains to form a cone shape. these are known as composite volcanoes E.G mount St Helens |
| shield mountain | eruption with less silica content couses the magma to be runny less explosive and forms winder shaped mountain called shield mountain E.G Hawaiian island |
| pyroclasts | superheated mix of dust gas and rock |
| volcanoes happen when | plates pull apart,plates crash together[subduction],crust splits at hot spots |
| location of volcanoes | mid-ocean ridges e,g iceland,pacisficring of fire e.g japan, new zealand,south america, hawaii, italy |
| hot spots | Volcanoes which form in the middle of plates e.g hawaii. a risk fountain of magma rises under the plane. the magma erupts through the crusts |
| a volcano | a moutain formed by the eruption of magma on the earths surface though a hole or vent in the earsths crust |
| lava | once the magma reache the surface it is now known as lava |
| basalt rock | lava cools quickly to form basalt rock |
| composite volcano | high silica content results in violent eruption. cause mountains to form a cone shape. these are known as composite volcanoes E.G mount St Helens |
| shield mountain | eruption with less silica content couses the magma to be runny less explosive and forms winder shaped mountain called shield mountain E.G Hawaiian island |
| pyroclasts | superheated mix of dust gas and rock |
| volcanoes happen when | plates pull apart,plates crash together[subduction],crust splits at hot spots |
| location of volcanoes | mid-ocean ridges e,g iceland,pacisficring of fire e.g japan, new zealand,south america, hawaii, italy |
| hot spots | Volcanoes which form in the middle of plates e.g hawaii. a risk fountain of magma rises under the plane. the magma erupts through the crusts |
| Dormant | a sleeping volcano that has not erupted for s long time mount fuji |
| extinct | a volcano that has not eruptrd for a long time and is not expected to again |
| active | a volcano that is erupting now has erupted recently and is likely to erupt again e,g mount etna italy |
| positive/ goodneffects of volcanoes | New land made. fertile soil. rock made. tourist attraction geothermal energy |
| bad/negative effects of volcano | kills people and animal.destroys everything in its path |
| environmenal impact | ash and dust pollute atmosphere weatheredcand etroded lava eand ash make fertile soil new land made tsunami lahars destroy farmland tonw and villages |
| social impact | people killed injured forced migration aircraft fling discrupted lack of clean water |
| economic impact | cost of repair to building roads railways poverty and unemployment as workplace destryes direct jobs in turism and rebuilding geothermal energy volcanoes make useful material gemstones |
Created by:
Eduarda