lava tube
The "tunnel" that magma travels through is called a vent.
It travels through a "Pipe" and explodes out the "Vent", or possibly the "Side Vent", and another world for the hole at the top is the Crater.
It is called a volcano, the hole is for the lava to come out.
vent
It is called a crater.
first lava flows out of several long cracks in an area. the thin runny lava travels far before cooling and solidifying. again and again floods of lava flow on top of earlier floods. After millions of years these layers of lava can form high plateaus!
Yes. When a volcano erupts, the top of it blows off. The lava spits out the top and it travels down the side. When the lava hits the ground, over the years it turns to ash and mabe 10 years later, it turns into a black, powdery dirt.
It could be called a cone, except the top part is "cut" off. A cone with the top cut off is called a conicalfrustum. See related links below.
Because the lava is heated and it floats to the top. It is heated and the lava gets less dense than the water so again it floats to the top.
Lava at the top of a volcano will generally flow downhill.
Lava is molten rock. The rock deep inside the earths mantle is always molten, and when it occasionally breaks through to the surface, the opening is called a volcano, and the liquid rock spilling out of the top is lava.
lava shoots out of the top