What do scientists use to figure out what life like in earlier times

"water seeps into rock cracks and dissolved minerals there.the solution travels through cracks in the. eventually concentrating into large crystals." which process is that

The length of the path between two points is what

The map above shows where people live in the united states. areas that are darker blue are areas where people live close together. areas that are lighter colors are places where people live farther apart. as a geographer, if you were to study where people live and why they choose to live in these places, which of the six essential elements of geography would you be using?