Question

Question 1.

3 tectonic environments where magma forms

Question 2.

Factors affecting magma Viscosity

Question 3.

Describe ways volcanic activity can be harmful to people, animals and resources like water.

Answer 1

1) The magma forms at mainly three Tectonic settings. These are-

a) Subduction Zones where one plate subducts under other and melts to form magma.

b) Diversion Zones where platesove away from one another and magma from mantle roses onto the surface.

c) Hotspot where Stationary exceptionally hotter areas of mantle which push magma upward on the Earth surface.

2) Magma Viscosity depends on mainly three factors -Temperature, Volatile Content, Silica Content.

Hotter, volatile rich, silica deficit lava is very less viscous and Cool, Volatile water less and Silica Rich lava is highly viscous.

3) Magma is extremely hot moving rock material which can turn everything in its way to ashes. So it is particularly harmful for man and animals. This is why eruption zones are great hazards for humans. Magma flow can remove water resources as ponds by evaporating it. Sometimes Gases in magna may dissolve into water sources making it poisonous.

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