Proofreading grammers of my paragraph?

BOOM! Another accident happened while someone talked on a cell phone and biked at the same time. This kind of accident happens every day at my school.

As i walk around the campus, nearly eighty percent of students on bicycles are either listening to music on their iPods or talking on their cell phones. Many students believe that listening to music while biking to the next class will help them relax after a boring class or a stressful test, but they do not realize the danger. They cannot determine if an accident is nearby or take action to prevent one from occurring. Recent bike statistics show that one out of every twenty people is in a bike accident each year. Because my school is in an area with a larger than average number of bicycles, the likelihood of accidents is increased.

In order to insure their own safety and that of others, cyclists should avoid listening to music or talking on cell phones. Although many individuals find biking while listening to music or talking on cell phones pleasant and relaxing, it becomes dangerous when they are not able to hear what is going on around them.

yet another turning element that is affecting Ralph is while Jack's hunters enable the sign fireplace to pass out and Jack storms out of the assembly to pass and splendor his very own tribe. With Jack long previous, Ralph can attitude issues like making a clean sign fireplace with a clean innovations. Ralph’s advantageous physique of innovations ends up of their making a clean sign fireplace.

BOOM! Another accident -happened- again while someone talked on a cell phone and biked at the same time. This kind of accident happens everyday at my school.
As i -walked- down the campus, nearly eighty percent of students -were- either listening to music on their iPods or talking on their cell phones while biking. Many students believe that listening to music while biking to the next class can -help- them relax after a boring class or a stressful test(no comma) but what many of them do not realize the danger behind it. -They- -lack- the ability to determine when an accident is nearby or take immediate action to prevent an accident from -occurring-. A recent bike statistics -showed- that one out of every -twenty- people get involved a bike accident each year. Because my school is a bike city, it increases the statistics of having even a higher number of people involved in accidents. People should avoid -listening- to music or -talking- -on- cell phones while biking, thus helps prevent accidents from -occurring- on -the- road. Although many individuals find biking while -listening- to music or talking on cell phones a pleasurable way to gain relaxation, it becomes dangerous when they are not able to hear road noises.

BOOM! Another accident happened while someone talked on a cell phone and while biking. This kind of accident happens every day at my school. As I walk through the campus, nearly eighty percent of students are either listening to music on their iPods or talking on their cell phones while biking.

Many students believe that listening to music while biking to the next class can help them relax after a boring class or a stressful test, but what many of which does not realize is the danger behind it. They lack the ability to determine when an accident is nearby or take immediate action to prevent an accident from occurring. Statistics from a recent bike study show that one out of every twenty people is in a bike accident each year. On my campus, there is an even greater likelihood of cyclists involved in accidents.

Cyclists should avoid listening to music or talking on cell phones while biking, helping to prevent accidents from occurring on the road. Although many individuals find biking while listening to music or talking on cell phones a pleasure and a way to gain relaxation, it becomes dangerous when they are not able to hear what is going on around them.

Grammers or grammars?

I'm no english teacher but it looks ok to me. I would consider changing

--- Many students believe that listening to music while biking to the next class can ehlp them relax after a boring class or a stressful test, but what many of which does not realize is the danger behind it ---

into two sentences and the usage of "which" doesn't work there.

also, -- thus helps -- doesn't read well. I would try -- thus helping --