Which of the following is correct regarding Cadera volcanos? Low viscosity magmas allow the gasses to escape leading to more passive eruptions. High viscosity magmas allow the gasses to escape leading to more passive eruptions. Low viscosity magmas trap the gasses leading to more explosive eruptions. High viscosity magmas trap the gasses leading to more explosive eruptions.

Option (2)

Explanation:

Caldera is the circular depression that forms at the top of a volcano due to the collapsing or eruption of a volcano. It is mainly initiated by the presence of high silica content or the viscous magma, that rises upward due to the force exerted by the uprising magma. This results in the explosive eruption of a volcano, forming a caldera through which the pyroclastic materials and toxic gases are released.

Thus, the correct answer is option (2).

High viscosity magma trap the gasses leading to more explosive eruptions.

Explanation:

The caldera is a large hollow shaped depression that is shortly made after the emptying of the magma chambers when a large volume of the magma has erupted and above chambers are lost. Due to the rich of silica contents of the magma has a higher viscosity and thus forms a high pressure when trapped within the rocks, spreading volcanic ashes wide over the areas when the lava flow may erupt.