Dunes that form when vegetation cover is broken by deflation and the dune tips point upwind are:a
longitudinal.
b. transverse.
c. barchan.
d. parabolic.
e. none of the above
D
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The Earth's magnetic field is generated by
A) salty water moving through the deep parts of the crust. B) convection currents in the asthenosphere. C) movement of iron and electrical currents within Earth's outer core. D) aligned magnetic minerals within Earth's inner core.
Which statement is true with regard to thermohaline circulation?
A) Thermohaline circulation is caused by even and steady global heating of the ocean. B) Thermohaline circulation is the result of heating of the ocean at high latitudes and cooling at low latitudes. C) Thermohaline circulation is driven by density gradients. D) Thermohaline circulation is primarily driven by wind.
What does this welded texture indicate about the formation of this rock?
A. The rock solidified at great depth. B. The magma formed some crystals before rising closer to the surface and solidifying. C. It formed from an explosive pyroclastic eruption. D. The magma had abundant dissolved gas.
Which ocean basin is the largest?
What will be an ideal response?