Which body of water in the russian domain was threatened by industrial pollution but has seen a reversal in its prospects due to efforts to protect it?

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

Where the main factor that enabled the growth of cities and civilizations was the existence 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.