Fact 1: When a cooler object touches a warmer object , thermal conduction occurs.

Fact 2: When the glacier moves into warmer areas the ice melts and sediments are deposited.

Given the two facts above, answer the question "Glaciers melt via" with the following options: 
- vaporization
 - thermal conduction
 - Water expanding
 - colder temperatures
 - mountain sources
 - internal combustion
 - decreased wind
 - Physical weathering


 

  thermal conduction       