Can someone do 13-16 pls

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Which action is a reflex action. a. asking for coffe in a cold climate b. blinking when light is flashed in the eyes c. drinking water when thirsty. d. swallowing food e. taking an exam

All other things being equal the size of a population will decrease if