Why are areas with fine sediments such as beaches are more vulnerable to erosion?

Beaches are more vulnerable to erosion because of destructive waves which erode the sediments

Here is a picture  of the net. its 4 squares in a row diagonal and on the third draw one square aove and under

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!