1. What is the most abundant gas found in magma?
a. Hydrogen b. Methane c. Nitrogen d. Oxygen
2.Which type of magma is most likely to erupt effusively from a shield volcano?
a. Cool, less viscous
c. Cool, viscous (sticky) magma
b. Hot, runny magma
d. Magma that has already partly crystallized below ground
3.An igneous rock that is fine-grained or glassy must have
a. crystallized slowly
c. formed deep underground
b. cooled deep underground
d. cooled rapidly after erupting from a volcano
4.A sheet like intrusion formed as magma pushes in between layers of rock is called
a. batholith
b. caldera
c. dike
d. sill
5.A pyroclastic flow is formed when an explosive eruption produces a dense mixture of
a. Water and lava
b. Water and magma c. Water and volcanic ash d. Hot gases and volcanic ash
(shattered rock and pumice)