Hi Mr. Wood its Brandon Pound. I think that I have the answers to the quiz. 1.The graph is showing there is 384 to 388 CO2 concentration(pm). 2.I think it was around 12 to 1:30 pm because the sun hits the ice and snow at a point where it doesn't release as much. I think the temperature and air density are also factors. 3.I believe that in two hours the CO2 will decrease. I think the temperature and air density will be main factors in this.