In which political system must all orders be obeyed?

What are the answers for the following questions?

The chemical or mechanical process by which rock is gradually broken down eventually becoming soil

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.