The volcanic eruption warning sign has not been the widening of the surface and cracks in the volcano. Thus, option 2 is correct.
Volcanic eruptions can be defined as the coming out of the lava and the magma from the earth's crust. The volcanic eruptions have consisted of magma along with several gases.
The change in the chemistry of the volcanic gas has been the warning sign of the eruption as there has been a change in the pressure and temperature of the gases that results in the explosion.
The volcanic eruption has been mediated by the shift in the earth's crust leading to earthquake activity.
The volcanic eruption has also been mediated with the warning sign as the activity of the animals, as some animals have been capable of listening to the waves that have been the indication of the volcanic eruption.
In the volcanic eruption, there has been no widening of the earth's surfaces or cracks in the volcano. However, this has been an alarming sign of the movement of the tectonic plate. Thus, option 2 is correct.
For more information about the volcanic eruption, refer to the link:
https://brainly.com/question/1622004
