Why doesn’t the Earth block out the light between the sun and the moon during a normal month?

Gold is not now being extracted from seawater. why not? a. it would be too disruptive to marine life to develop any marine mineral resources b. there is no gold in seawater c. we don't know how to extract minerals from seawater d. it would be too costly and difficult to separate the small amount of gold from the very large amounts of halite and other minerals

On nights when we see the new moon phase, what side of the moon are we seeing?

Suppose you had to resolve the problems believed to be caused by distance decay in russia. what would you suggest?