Consider the following:Pyroclastic debrisAsh and dustNitrogen compoundsSulphur compoundsHow many of

Question

Consider the following:Pyroclastic debrisAsh and dustNitrogen compoundsSulphur compoundsHow many of the above are products of volcanic eruptions?

Accepted Answer

A volcano is a place where gases, ashes, and/or molten rock material – lava – escape to the ground. A volcano is called an active volcano if the materials mentioned are being released or have been released out in the recent past.The layer below the solid crust is the mantle. It has a higher density than that of the crust. The mantle contains a weaker zone called the asthenosphere. It is from this that the molten rock materials find their way to the surface.The material in the upper mantle portion is called magma. Once it starts moving towards the crust or it reaches the surface, it is referred to as lava. The material that reaches the ground includes lava flows, pyroclastic debris, volcanic bombs, ash and dust, and gases such as nitrogen compounds, sulphur compounds, and minor amounts of chlorine, hydrogen, and argon.Hence, option (d) is the correct answer.Source: NCERT: Class XI Fundamentals of Physical Geography