<map version='1.0.1'>
<node TEXT='Sound Waves'>
<node TEXT='Properties of Sound Waves'>
<node TEXT='Amplitude'/>
<node TEXT='Frequency'/>
<node TEXT='Wavelength'/>
</node>
<node TEXT='How Sound Travels'>
<node TEXT='Mediums'/>
<node TEXT='Speed'/>
<node TEXT='Reflection'/>
<node TEXT='Refraction'/>
</node>
<node TEXT='Applications of Sound Waves'>
<node TEXT='Musical Instruments'/>
<node TEXT='Echoes'/>
<node TEXT='Sonar'/>
<node TEXT='Ultrasound'/>
</node>
</node>
</map>