Answer:
main vent - this is the channel through which magma travels to reach the Earth's surface. secondary vent - some magma may escape through the side of the volcano, particularly if the main vent becomes blocked. crater - this is found at the top of the volcano, where the magma erupts from.
This is very very easy its oubvously A.you are pain free
"I like what you did when you presented the slideshow! It brought a smile to my face!"