<map version='1.0.1'>
<node TEXT='Sound Waves'>
<node TEXT='What are sound waves?'>
<node TEXT='Definition'/>
<node TEXT='Characteristics'/>
</node>
<node TEXT='How do sound waves travel?'>
<node TEXT='Mediums of sound'/>
<node TEXT='Speed of sound'/>
</node>
<node TEXT='Uses of sound waves'>
<node TEXT='Communication'/>
<node TEXT='Music and entertainment'/>
<node TEXT='Medical imaging'/>
</node>
</node>
</map>