Basaltic magma eruptions usually take which form?

Basaltic magma eruptions usually take which form?
   a. lava flows
   b. pale ash flows
   c. lahar
   d. steam-rich explosions
   e. ash-rich explosions

Question 2

Which type(s) of magma result in erupted material that is mostly in the form of ash?
   a. rhyolite only
   b. andesite only
   c. basalt only
   d. both andesite and basalt
   e. both basalt and rhyolite

Question 3

When comparing the characteristics of common magmas or lavas, ____.
   a. rhyolite has the lowest water content
   b. andesite has the lowest viscosity
   c. basalt has the highest silicate content
   d. rhyolite has the highest viscosity
   e. basalt has the lowest temperature

Question 4

The volume of magma expelled in an eruption depends on ____ of the magma.
   a. the temperature and volatiles but not the viscosity
   b. the temperature and viscosity but not the volatiles
   c. both the viscosity and volatiles
   d. only the volatiles
   e. the temperature, viscosity, and volatiles

Question 5

Compared to other types of magma, basalt ____.
   a. has lower viscosity, but equivalent silica content
   b. has lower viscosity and higher silicate content
   c. has higher viscosity and lower silicate content
   d. has higher viscosity and higher silicate content
   e. has lower viscosity and lower silicate content

Question 6

The two most abundant gasses in magmas are ____.
   a. sulfur dioxide and carbon dioxide
   b. water vapor and oxygen
   c. oxygen and carbon dioxide
   d. methane and carbon dioxide
   e. water vapor and carbon dioxide