6. what geographic reason explains why russia would not have many usable harbors on
its long northern coastline?

Latitude

Explanation:

Russia is located at a very high latitude, and it's northern coast  is entirely on the Arctic Ocean. Due to the extremely cold conditions found above the Arctic Circle, there are very few ports that are usable year-round due to the formation of sea ice. One of the few exceptions to this rule is Murmansk which benefits from the moderating waters of the Atlantic Ocean.

primary groups shape your individual development

explanation:

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.