1. Molten materials with _____ are formed when magma is generated by partial melting in upper mantle.
2. The _____ will, rise towards the surface. The rising basaltic magma may reach a point were the rocks above are les dense.
3. As the crustal rocks approach the surface their _____ decreases.
4. Mineral with high melting temperatures may crystallize first as the _____ bodies cool.
5. Some of these melted materials may rise to the surface forming a _____.
6. The primary factors that determine whether a volcano will _____ or not include magma's composition.
7. Magma associated with violent eruption may be five times more _____ than an inactive magma.
8. As _____ cools and starts to solidify, its mobility decreases and eventually the flow stops.
9. The _____ of magma is another important factor affecting volcanic activity.
10. _____ prevents the flow of magma because during crystallization process, silicate structures start to link together into long chains

CHOICES:
Lava
buoyant molten rock
basaltic composition
erupt violently
magma
silica
density
viscous
volcanic eruption
chemical composition