How do volcanoes affect the land?

Answer 1

It changes the land by creating it bigger for example when it erropes time passes and it cools down then it freezes and creates land.

Answer 2

Recorrecting previous answer:

Firstly, by way of a collision plate boundary i.e. two continental plates colliding, huge mountain ranges are formed due to the lack of subduction between the two due to both having a lower density than the asthenosphere in the upper mantle. This means that they literally "push" upwards creating examples such as the Himalaya mountain range.

Volcanic impacts:

There are many different types of volcanoes for example shield, composite, cinder cones; with each having significantly different characteristics. However, one of the most important features of a volcano is the lava/ magma type. This variety is caused by the varied formation of the volcanoes i.e. whether they were formed at a hotspot, at a subduction zone etc. At subduction zones the magma is usually andesitic. This is due to the fact that the oceanic crust is being subducted hereby causing it to melt within the upper mantle due to temperatures as high as between 750c and 950c. This subduction causes the melted rocks to rise due to convection currents within the earth, and so volcanic activity is created as the magma, (i.e. the melted rock) reaches the surface. It is due to this subduction process (where huge stores of water are released) and the huge frictional tensions involved that cause the andesitic rock type i.e. the high silica content caused from the melting of the subducted plate creates highly viscous lava. As this climbs the magma chamber and reaches the surface the magma cannot escape from inside the volcano. This builds up huge pressure over time, and when the pressure is great enough, a huge explosive eruption occurs.

Basaltic lava types create low viscous magma, due to the fact that there is a low silica content, because there is no subduction taking place. This creates "runny" lava due to its lesser viscocity. The eruptions are usually not explosive, with this being because the pressure within the volcano is far less as small cracks on the sides of the volcano can be "escape routes" for "runny" magma. Basaltic lava is also much hotter than andesitic lava, reaching around 1000*c; which also tends to explain why the pressure is less (meaning that the crater of the volcano is melted from inside).

Basaltic lava normally creates lava plateaus as the lava is very hot and fast moving due to its low viscocity/thickness. Over times these can build up to be around 1000m high.

It has only just the tip of the iceberg but i hope that this has helped......

Answer 3

Volcanoes change landscapes by toppling trees, burning dens and plants, and driving out animals with its volcanic ash. The ash and smoke can affect the air, and water making it hazard to animals and even life. In a period of time though, the ash becomes a new layer of soil for new plants and life! Hope this helps a little!

Answer 4

Hi

Referring to an article printed in the Daily Mail 10th November 2011. A new Canary Island is emerging from the sea as an underwater volcano bubbles to the surface. Magma off the coast of the Canary Island of El Hierro has been spewing at least 20 meters, 60 ft high as the sea boils with a smell of sulphur ( rotten eggs smell).

As it gets closer to the surface, debris such as stonestart to shoot out of the volcano. As it grows it could eventually join up with the mainland of El Hierro.

To see new land that was created by volcano's Google "New volcanic islands".

Answer 5

Recorrecting previous answer:

Firstly, by way of a collision plate boundary i.e. two continental plates colliding, huge mountain ranges are formed due to the lack of subduction between the two due to both having a lower density than the asthenosphere in the upper mantle. This means that they literally "push" upwards creating examples such as the Himalaya mountain range.

Volcanic impacts:

There are many different types of volcanoes for example shield, composite, cinder cones; with each having significantly different characteristics. However, one of the most important features of a volcano is the lava/ magma type. This variety is caused by the varied formation of the volcanoes i.e. whether they were formed at a hotspot, at a subduction zone etc. At subduction zones the magma is usually andesitic. This is due to the fact that the oceanic crust is being subducted hereby causing it to melt within the upper mantle due to temperatures as high as between 750*c and 950*c. This subduction causes the melted rocks to rise due to convection currents within the earth, and so volcanic activity is created as the magma, (i.e. the melted rock) reaches the surface. It is due to this subduction process (where huge stores of water are released) and the huge frictional tensions involved that cause the andesitic rock type i.e. the high silica content caused from the melting of the subducted plate creates highly viscous lava. As this climbs the magma chamber and reaches the surface the magma cannot escape from inside the volcano. This builds up huge pressure over time, and when the pressure is great enough, a huge explosive eruption occurs.

Basaltic lava types create low viscous magma, due to the fact that there is a low silica content, because there is no subduction taking place. This creates "runny" lava due to its lesser viscocity. The eruptions are usually not explosive, with this being because the pressure within the volcano is far less as small cracks on the sides of the volcano can be "escape routes" for "runny" magma. Basaltic lava is also much hotter than andesitic lava, reaching around 1000*c; which also tends to explain why the pressure is less (meaning that the crater of the volcano is melted from inside).

Basaltic lava normally creates lava plateaus as the lava is very hot and fast moving due to its low viscocity/thickness. Over times these can build up to be around 1000m high.

It has only just the tip of the iceberg but i hope that this has helped......

Answer 6

the volcanoes can change the land with its magma that has incredibly high tempatures. the magma turns into lava if the lava hits the side of th volcano it dries into another layer on it. if the lava hits water thaen it is cooled instantly this is how Hawaii was made.

Answer 7

Volcanoes change landforms by build up of lava making the volcano bigger in size. It also makes rock on the surface of where the lava hardens.

Answer 8

It changes the land by creating it bigger for example when it erropes time passes and it cools down then it freezes and creates land.

Answer 9

the volcano changes cause of magma

with incredibly high tempatures.

Answer 10

When volcanoes erupt and cool down it turns into rock. The magma changes land after it cools. the rocks then form into hills and change the land's look, and size/texture.