What caused columbus to think he had reached aisa

During the invasion of the soviet union, the einsatzgruppen did which of the following? killed large numbers of jews, as well as many locals. led military troops. eliminated local administration in lithuania. took over many administrative functions in the war effort. planned and organized extermination camps.

List three reasons why explorers began to explore new, and old areas. [[ps: doesn't explicitly say where. i think it's more in general.

Name three new weapons that changed how ww! was fought and how?