21. light changes its direction when travelling through a new medium because denser mediums have a higher angle of refraction.
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Basic truss bridge types found in North Carolina (source: HAER) A truss bridge can be characterized by the location of its traffic deck. At a pony truss, the travel surface passes along the bottom chords of trusses standing to either side that are not connected to each other at the top.
Answer:
1
Explanation:
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