The most CONSTANTLY active seems to be the Mid Atlantic Rift - which is spreading apart at about 2-3 centimeters per year and is actively emitting materials all the time. Iceland is at the northern terminus and has regularly active volcanoes.
Along the Pacific plate, the "Ring of Fire" is active as the plate interacts with plates around it. For more information, see the Related Link.
A planetary ring
Their small and rocky surfaces
The number of planets is not known. The number of stars is not known either, nor if all have planetary systems. Certainly many billions of billions.
There is only one planet in the solar system that is known to have active volcanoes. That is Earth.
"WhatIS IT CALLED when a Volcano is not active" do you mean? It is known as Extinct or Dormant
A planetary ring
Planetary model.
Tectonically: because it [Asia] resides at the western edge of what is known as "The Sea of Japan based Geologic Ring of Fire".
Known for his eponymous laws of planetary motion.
No. Kepler discovered the laws using Tycho Brahe's data.
This is broadly known as planetary differentiation.
The Stingray Nebula, the youngest known planetary nebula.
Their small and rocky surfaces
The name Aveen is known as an Indian name and it means "Centre of the Planetary System"
6 flat surfaces - known as faces, 12 edges 8 vertices.
A mobile belt is an elongate, narrow region of crust experiencing tectonic activity (e.g. earthquakes, volcanoes, mountain building). When a mobile belt becomes tectonically inactive it is known as an orogenic belt.
The most chemically active element is the halogen known as fluorine. Be