There are 3 main types of unconformities: Disconformity: and unconformity between parallel layers (e. g. strata or lava flows). a. True
b. False

Ibelieve it was because of the gas act in order to preserve fuel 

Add the map and the options so i can further you, you so much. : )

The first immigrants to settle in what is now the united states were the ancient ancestors of modern native americans. the precise routes of those first north american immigrants are disputed, but there is no uncertainty about the fact that every human being on the continent is either a recent immigrant or a descendant of earlier immigrants. since the first immigrants came here from asia more than thirteen thousand years ago, there have been four large and easily recognizable modern waves of immigrants into the united states.