Probably erosion...either by wind, run-off water or a river that drains into the ocean near the ports.
Hope this helps!
Answer:
3.2 piles
Explanation:
step 1
Find out the number of lumps in 10 clumps
we know that
3 lumps equals 1 clump
by proportion
Let
x ----> the number of lumps

step 2
Find out how many piles are 96 lumps
we know that
10 clumps equals 1 pile
10 clumps equals 30 lumps
so
1 pile equals 30 lumps
using proportion
Let
x -----> the number of piles
