Dashboard Crack problems of the 2007 GMC Sierra

My dash has large gaps/cracks in the dashboard. These range from the windshield all the way the front piece of trip. The dash is completely separated. Right in the center of the dash, around the airbags, and the other smaller parts or the dash are cracked too. I use a sun shield, so that is not the case. My daughter and I have both cut our hands on the dash. She was so surprised when she got in the truck that she asked if I had a wreck, and then ran her hand over the dash and cut her palm ad two fingers. I also cut my hand while trying to clean it so that stuff does not drop down the crack, such as dirt or dust, can't that start a fire with the wires and the heater down there? another thing is my vents don't wok like they are suppose to. The dash is so broken you can hear sounds of plastic vibrating and blowing in the vents. This directly effects the air flow to, it's like its not even connected. This all happened while the vehicle was in the garage stationary not running.