Why do geographers use maps and what do maps tell us?

Maps present information about the world in a simple, visual way. They teach about the world by showing sizes and shapes of countries, locations of features, and distances between places. Maps can show distributions of things over Earth, such as settlement patterns.

Maps help know where location or Capitals of the world or much more

Magma is outside the volcano  and lava is inside the volcano. 

5×^2+20-15 or -(5x^2-20+15)