The long tube in the ground that connects the magma chamber to Earth's surface is called the

a. vent.

b. side vent.

c. pipe.

d. crater.

The long tube in the ground that connects the magma chamber to Earth's surface is called the vent. The Vent is the main outlet through which the magma escapes to the earths surface. The side vent / secondary vent are other smaller outlets at the sides of the the vent through which the magma escapes to the earth.