A nation that typically has higher average income, slow population growth, and many different types of economic activity
Explanation:
This is because a developed nation would be a nation that has been founded for more than 300 years (I think). They would have more population and economic activity due to the fact that it has been founded for a very long time. Meaning that growth and economic activity have been going on for centuries.
The continental crust is made up of rocks that consist primarily of silica and alumina called the "sial". The next layer of the Earth is called the mantle.
Mountains isolated many groups that migrated to the region. Dense forest served as a barrier to migration across the region. Vast plains facilitated the migration of people across the region.
