What is significance about th ground of the Arctic plains?

When you cross a time zone going east what happens to the time

In the diagram below, ab and bc are tangent to o. what is the measure of

Which events occurred during the space race? check all that apply. (a) nasa was established. (b) yuri gagarin orbited earth. (c) the soviet union launched salyut. (d) the united states launched skylab. (e) the united states launched explorer 1.