The answer is: waterfalls can usually be found wherever there is lots of erosion or where there is steepness in the river's channel.
the equation would be (3w+w)2=32.
this means you add 3 times the width p,us the width (length plus width).
this becomes 6w=32.
w=5 1/3.
l=3w
l=3(5 1/3)
l=16
Therefore, 18 gram atoms hydrogen are present in dilute acid. Hope this helps :)
