Describe the theory of plate tectonics.
What will be an ideal response?
The theory of plate tectonics states that the lithosphere is broken up into about eight large and several smaller rigid moving plates that move in response to convection cycles within the planet's interior. Two types of boundaries between these plates are divergent and convergent plate boundaries. These boundaries are the sites where crust is formed (by seafloor spreading) and destroyed (at subduction zones). At transform boundaries, plates slide past each other horizontally.
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Which of the following locations best represents the Ekman spiral current?
A) A
B) B
C) C
D) D
The longitudinal profile of a stream:
a. extends across a channel at right angles to the banks. b. extends from source to mouth. c. is used to calculate cross-sectional area. d. is determined from a hydrograph. e. is determined by stream ordering.
Tephra is the same as ____
a. lava b. pyroclastic material c. mudflows d. aa
The present estimate of the Earth's age is about ________ years
A) 50 million B) 500 million C) 2.8 billion D) 4.6 billion E) 2.8 trillion