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← GeographyWhich process limits magma dome steepness during effusive eruptions?
A)Viscosity-limited spreading✓
B)Pyroclastic density currents
C)Atmospheric pressure differentials
D)Groundwater hydrothermal alteration
💡 Explanation
Viscosity-limited spreading caps dome slope because magma viscosity resists flow under gravity; the resultant topography diffuses outward, rather than steepening. Dome steepness is therefore viscosity-controlled, rather than dictated by purely external forces or alteration processes.
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