If the Magma Reaches the Surface,it Forms Volcanic Rocks,named for Vulcan,the

Q25: The presence of water _ the melting

Q26: No magmas contain dissolved gases.

Q27: The process of mineral formation in a

Q28: If the magma cools and solidifies below

Q29: Slow flowing,more viscous basaltic lava commonly has

Q31: Basaltic magmas have low contents of SiO₂,low

Q32: Hawaiian volcanoes produce andesitic lava.

Q33: About 80 percent of the magma reaching

Q34: On 20 February 1943,a new volcano,a scoria

Q35: _ eruptions are the most violent types