Fill in the Blanks Volcanoes Fill in the BlanksOnline version A fun game to test your knowledge about volcanoes. Fill in the blanks with the correct words to complete the sentences! by Sarah Clarke 1 if since because when When Magma is pushed up through the opening a volcano erupts . Eruptions can cause other natural disasters pressure is released . Volcanoes can be disruptive it spurts out hot ash . Lava and hot ash are released a volcano erupts . a volcano erupts , magma is pushed through the opening .