How did people find the way before the invention of maps

What is the relationship between groundwater and aquifers?

Ineed , i need to create a power point in life science here is a picture explaining a little what the topic is about, me with some information for my slides : (

What happens when heat from inside earth is transferred to its surface? warmer material is pushed to the crust more dense material is pushed to the crust warmer material is pushed to the outer core less dense material is pushed to the outer core