What physical process could geographers track with an arrow on a flow-line thematic map

The physical process could geographers track with an arrow on a flow-line thematic map is the Proportional or graduated symbols, it says that the data used often with these maps are circles and squares and other geometric shapes as well.

Answer: the philippines has suffered from an inexhaustible number of deadly typhoons, earthquakes, volcano eruptions and other natural disasters. this is due to its location along the ring of fire, or typhoon belt – a large pacific ocean region where many of earth's volcanic eruptions and earthquakes occur.