What is the minimum water velocity needed in a stream to maintain the transportation of the smallest diameter boulder?

1 ). 100cm/s
2 ). 150cm/s
3 ). 250cm/s
4 ). 400cm/s

B) an efficient process

The  knowledge gap  as been recast more recently as a “digital divide”  gap. with the internet and social media many things can be done faster and better. so much faster and better that those that do not have access to them are literally left out of the game.