I'm am unsure what context the answer needs to be in or how specific they need to be. Minerals are used in most building supplies, fertilizers, cooking ingredients, and machinery.
Yes, slaves wanted to return to Africa because Africa didn't have slavery.
Higher density simply means new residential and commercial development at a density that is higher than what is typically found in the existing community.
Lower density describes housing developed at densities less than those recommended in the government's guidelines.
When two people believe in the same religion it unifis them because they not have someone who shares their personal views and moral standards however, say a man of another religion with the same views and standards but of a different religion comes in, an intolerant person would immediately exile said person, so in this way religion is dividing because people that, most likely, would be friends and get along greatly are now separated by theit varying concept of "religion".
