Perform the operations and simplify. 
Definitions:
Refracted Wave
A wave that changes direction and speed as it passes from one medium to another due to differences in densities.
Material
Any substance or matter used in manufacturing, construction, or composition of something else.
Stream Channel
The physical confine of a stream (rivulet) consisting of a bed and banks, which confines and directs water flow.
Linear Ridges
Long, narrow elevations of land often formed by tectonic activities such as the folding of the Earth's crust or by the solidification of magma.
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