1. Volcanoes Are Openings Of The Earth's Surface..
2. The Word Volcanoe Comes From The Word' Vulcan.
3. Volcanoes Can Be Active, Dormant Or Extirct.
4. The Liquid Inside The Volcano Is Called Magma.
5. Lava Is The Liquid That Is Expelled From The Volcanoe.
6. Lava Is Very, Very hot!
7. There Are Volcanoes On Other Planets too!
8. There Are Around 1,500 Active Volcanoes In The World.
9. The Largest Volcanoe On Earth Is Mauna Loa In Hawaii.
10. Volcanoes Are Usually Where Tectonic Plates Meet...

OP, take your time to expantiate.. Vulcan, Extirct ,Lava.

1. Lava
Lava, Magma (Molten rock) Emerging As A Liquid Onto Earth's Surface.
2. Extirct
(of a Species, Family, Or Other Group Of Animals Or Plants) Having No Living Member; No Longer In Existence.
3. Vulcan
In Latin Is The god Of Fire Including The Fire Of Volcanoes.

Are you a Geologist? If so, some of the terminologies were not truly described. A lava is not 100% liquid. It is molten. Both magma and lava are the same, only that the former is found beneath the volcanoes while lava is a magma ejected through the caldera to surface.