Which outcome occurs when viscous lava cools rapidly against glaciers?

💡 Explanation

Steep-sided volcanic mesas (tukurs) form because the rapid SURFACE cooling from glaciers induces COLUMNAR JOINTING within the viscous lava; therefore, rapid cooling causes steep mesa formation, rather than other volcanic landforms from slower effusion.

• Which risk increases when an oxbow lake forms close to agricultural land?
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• Which phenomenon causes the formation of thermoclines in deep temperate lakes during summer months?