Mechanical
Explanation:
The melting of ice in polar regions primarily increases mechanical weathering. As the ice melts, it leads to frost action, which is a form of mechanical weathering. When water enters cracks in rocks and freezes, it expands, exerting pressure on the rock. As the ice melts and refreezes, the rock fractures and breaks apart. This process is accelerated in polar regions where temperature fluctuations occur frequently. Although chemical and biological weathering can also occur in these regions, the most significant increase in weathering due to melting ice is mechanical weathering.
