Answer:
Hydrogen in the core of the star is converted to helium by nuclear fusion. When the hydrogen supply in the core begins to run out, and the star is no longer generating heat by fusion, the core becomes unstable and contracts.
Answer:
True.
In pre-colonial Africa, some primitive versions of government systems were used.
Well a cinder cone volcano doesn't have a top. It was a funnel like shape most likely caused by the volcano violently erupts.
Composite volcanoes do have a point that is made up of past eruptions
