The part of a soil profile that is made up of partly weathered rock is the: subsoil
regolith
bedrock
topsoil

Answerair masses develop near the equator are warm; tropical air mass

It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.

Ithink i might know wait one second let me serve