The earth is girdled by a chain of volcanoes, formed by cooled molten rock, from which most of the terrestrial heat is emitted.
(The earth; is girdled; by a chain of volcanoes) (volcanoes; formed; by cooled molten rock) (most of the terrestrial heat; is emitted; )
The earth volcanoes most of the terrestrial heat
is girdled formed is emitted
by a chain of volcanoes
by cooled molten rock