The viscosity of magma depends upon its silica content and its a. pahoehoe. b. temperature. c. magnetism. d. pyroclastic flow.

Option B, Temperature

Explanation:

Viscosity of magma is inversely proportional to its temperature. Thus, the higher the temperature, the lower is the viscosity and thus more rapidly the magma flows. Magma with lower temperature have high viscosity and thus they flow slowly.

high Viscosity = low temperature

low Viscosity = high temperature

Based on temperature lava produced from magma are of two types –  

a)Pahoehoe  - low viscosity lava  

b)Aa  - high viscosity lava.

answer; i believe the answer is hydraulic action;

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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