Items like straws are lightweight, so wind and rain can push them into storm drains, where they get washed out into local creeks, rivers, bays, and flow downstream towards the ocean.
Plastic items like straws take a LONG time to break down completely - an estimated 200 years! That means every straw ever created is probably still here on Earth someplace. But, they can break into smaller pieces, called Microplastics.
Microplastics can look like plankton, which animals like fish & turtles love to eat. Animals can eat these microplastics and become sick, OR end up in the fish on our plates. Now WE are eating that plastic straw!