A) formed by the up folding, or arching, of rock layers
B) downwards, or troughs, found in association with anticlines
C) a fold
D) a volcanic eruption in mexico
What materials are ejected from volcanoes?
A) lava
B) Magma
C) Volcanic ash & dust
What are the 3 main types of volcanoes?
A) shield, cinder, composite
B) shield, triangular, composite
C) shield, cylinder, triangular
What is a composite volcano?
A) Produced by the accumulation of lavas
B) Ejected lava fragments the size of cinders
C) Large, nearly symmetrical structure composed of layers of both lava & pyroclastic depostis
D) an inactive volcano
What is stress?
A) distortion of rock
B) force per unit area acting on a solid!!
C) fracturing of an object once its strength is exceeded
D) change in shape or volume of a body of rock as a result of stress
What determines the type of volcanic eruptions?
A) magma composition
B) magma temperatures
C) amount of dissolved gasses in magma
D) all of the above
What is deformation?
A) the change in the shape of rock in response to stress
B) A force that acts on rock to change its shape or volume
C) straining
D) the balancing of the downward force
What is a caldera?
A) rock
B) large depression in a volcano
C) crater
D) pipe
What is NOT a major factor that influences the strength of a rock?
A) time
B) rock type
C) age of rock
D) temperature
What is viscosity?
A) substances resistance to flow
B) magma composition
C) amount of dissolved gasses
D) magma temperature
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