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← GeographyWhich problem develops in Arctic pipelines when seasonal temperature changes reduce ground cohesion?
A)Decreased shear strength✓
B)Increased methane hydrate formation
C)Elevated elastic modulus
D)Reduced thermal conductivity
💡 Explanation
Decreased shear strength develops because solifluction weakens the soil around the pipeline, reducing support. The pipe yields under its weight or external loads; therefore, shear strength decreases, rather than stiffness, conductivity, or hydrate formation dominated solely by temperature change.
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