Because there is no more magma in them.
They are dormant volcanoes.
We do not know for sure but over geological time millions of volcanoes have become extinct.
When volcanos stay dormant they are classified as extinct
The extinct volcanos name is Diamond Head
neptune is a gas giant. gas giants do not have volcanos.
There are 48 active, dormant and extinct volcanoes in Auckland.
They did, that is how the islands formed. But most of the volcanos are extinct and no longer erupt.
venus - active volcanos injecting sulfate into atmosphere, heat from radioactive decayearth - active volcanos, heat from radioactive decaymars - extinct volcanos, no activity in milllion of years, heat from radioactive decayio - active volcanos, heat from mechanical strain from orbit shapeThere are probably others.
None. Dinosaurs went extinct before grass evolved.
Pterosaurs declined during the Late Cretaceous due to competition with early birds. The last pterosaurs became extinct in the End Cretaceous Mass Extinction, which was caused by an asteroid impact in the Gulf of Mexico.
By chopping down the gamba grass
The other kind of volcano is an extinct volcano.