About my friends questions:
1-Eskimos an Alaskan are divided into various tribes. Even though each tribe has its own language and custom , they are very similar. These tribes include Yup'Ik and Cup'Ik in western Alaska, Athabaskan in central Alaska and Aleut, Tlingit, Alutiq, Inuit, Inupiqa slattered in different location in Alaska.
2-Among the language the native Alaskans is not a written language. Its history-cultures are passed through by oral tradition.
3- Igloo is an Eskimos house that makes of sod, wood , stone , blocks of snow or ice.