In alaska, crude oil is carried across the tundra by airplane boat aqueduct pipeline

Pipeline is the correct answer.

Explanation:

The oil is transported via trans Alaska gas pipeline. This pipeline extends for 800 miles from the north coast of the Arctic Ocean to the south to the coastal waters of Prince William Sound in the Town of Valedz. It transports crude oil from the slope of Alaska(Purdhoe Bay) to Valez (Innermost ice free part of US). It transports almost 13 percent of the nations total oil production and was constructed from 1969 to 1977.

stewards ice box was the purchase of alaska from russia and it was called that because people thought it was not a good idea to purchase alaska

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.