Which deformation regime results from differential cooling lava?

💡 Explanation

Columnar jointing happens because thermal contraction creates stress resulting in fractures, therefore geometric columns form, rather than either smoother pahoehoe surfaces because of faster surface cooling, or aa flows when viscosity is higher.

• Which outcome results when a tectonic uplift increases the gradient of a river feeding an alluvial fan?
• Which outcome is most likely when urban infrastructure crosses a major transform fault zone?
• Which geographic outcome increases surrounding arable land degradation when overgrazing eliminates vegetation?
• Which atmospheric river risk increases upon landfall due to the orographic effect?
• Which mechanism limits sediment deposition rate within a fjord undergoing isostatic rebound post-glaciation?
• Which risk increases when thermohaline circulation weakens substantially due to polar ice melt?