If the magma chamber beneath volcano b empties and then collapses, what kind of feature will form? explain.

Caldera

A caldera is a volcanic form which develops by the collapse of the volcano into itself. It occurs when the magma chamber beneath the volcano gets emptied and the the area is not able to support the volcanic debris. The fractures develop in the vents of the volcanic crater.  

b.

explanation:

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000