Final answer:
The question pertains to Geography, regarding cities within 500 kilometers of active plate boundaries. Examples include Tokyo, Jakarta, and San Francisco, which are close to where tectonic plates meet and therefore at risk for earthquakes.
Step-by-step explanation:
The question you have asked is related to the subject of Geography, where you are required to identify cities that are located within 500 kilometers of an active plate boundary.
This distance metric helps in understanding the potential seismic and volcanic hazards in those regions as cities near active plate boundaries might be more susceptible to earthquakes and volcanic activities. Some examples of cities that are within 500 km of active plate boundaries include Tokyo, Japan; Jakarta, Indonesia; and San Francisco, USA.
Each of these cities is located in a region where tectonic plates meet, which can lead to a higher likelihood of geological events such as earthquakes.
The complete question is: consider those cities that plot in the first bar (are located within 500 km of an active plate boundary). applying the 500 km metric, list below the cities that are close to a is: