1 (b) A narrow street between the fronts of houses or businesses. 2  This type of alley is found in the older parts of many cities, including American cities like Philadelphia and Boston (see Elfreth's Alley, Philadelphia, Pennsylvania). 3  Many are open to traffic.
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P and S waves. A wave is a vibration that transfers energy from one place to another without transferring matter (solid, liquid or gas). Light and sound both travel in this way. Energy released during an earthquake travels in the form of waves around the Earth. Two types of seismic wave exist, P-and S-waves. and S waves. A wave is a vibration that transfers energy from one place to another without transferring matter (solid, liquid or gas). Light and sound both travel in this way. Energy released during an earthquake travels in the form of waves around the Earth. Two types of seismic wave exist, P-and S-waves.