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An explanation of the effects of Magnetic Arc Oscillation on the wall geometry based on forces that act on the molten metal during layer deposition was made .
 concept or principle: Arc; concept or principle: geometry; concept or principle: forces; material: molten metal; process parameter: layer; concept or principle: deposition
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: Arc; concept or principle: geometry; concept or principle: forces; material: molten metal; process parameter: layer; concept or principle: deposition