The type of map above uses lines to show slope and elevation. what kind of map is shown in this image?

Brazzaville and kinshasha, luanda,librevilleand and monrovia.

Ba rock that formed 1,400 million years ago!

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.