Geothermal energy is produced by ____.
A)hydraulic fracturing
B)recent or current volcanic activity
C)heat from Earth's interior
D)hot springs
E)states in the southern U.S.
Question 2A dense cloud of pyroclastic materials and a glowing cloud of gases and dust is called a(n) ____.
A)nue ardente
B)ash cloud
C)eruptive blast
D)mantle plume
E)fumerole
Question 3Platform sedimentary rocks are entirely carbonate rocks.
Indicate whether the statement is true or false
Question 4What is the heat source for hydrothermal activity on land?
A)earthquake faults only
B)recent or current volcanic activity only
C)deep heat in Earth's interior only
D)earthquake faults and recent or current volcanic activity
E)recent or current volcanic activity and deep heat in Earth's interior
Question 5A ____ is a type of volcano that has a steep-sided slope near its summit but a decreasing slope toward the base.
A)shield volcano
B)cinder cone
C)fissure volcano
D)composite volcano
E)lava dome
Question 6The Appalachian and Ouachita mountains represent ancient mobile belts.
Indicate whether the statement is true or false
Question 7What is contaminated groundwater so difficult to clean?
A)Groundwater moves so quickly.
B)Groundwater does not move at all.
C)Groundwater moves so slowly.
D)Subsidence pushes the contamination deeper underground.
E)Septic systems are so common.
Question 8A lahar may form when ____.
A)lava is cooled quickly underwater
B)volcanic gas is erupted into the stratosphere
C)lava cools and cracks along joints
D)magma moves through fissures in the country rock
E)rain falls on unconsolidated pyroclastic materials