The islands of Hawaii were created by
A) thin continental crust separating and creating a rift valley.
B) plumes of hot mantle rising in a hot spot within a plate.
C) plates that have slipped sideways relative to each other, creating a fault.
D) a plate that has run up against an existing continental plate.
E) a fault.
B) plumes of hot mantle rising in a hot spot within a plate.
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A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the vertical impulse the catapult receives from the rock is
A.
B.
C.
D.
E.
The aurora borealis (northern lights) are caused by
a. sunlight reflecting from polar ice. b. emissions from atoms and molecules in the upper atmosphere excited by electrons from the Sun. c. thunderstorms. d. an unknown process.
Which has a larger volume, a liter of water or a liter of mercury (a liquid metal)?
a. water b. mercury c. none of these
____ is (are) produced by atomic transitions in the presence of a strong magnetic field
a. Differential rotation b. Granules c. The Zeeman effect d. Spicules e. The coronal hole