The ash cloud created by the volcanic explosion was so big, it was deadly.
The ash cloud moved from Iceland all the way to the area of the United States
The cloud of ash settled over the Midwestern part of the US for about six months.
Also, the process of cellular respiration and photosythesis could not occur because the cloud of ash was blocking the sunlight from getting to the surface of the US.
Life in the US became very hard because of the ash cloud. The pollution from it was very bad for the enviroment.
And so with photosynthesis not being able to happen, neither can cellular respiration. These two processes are very important in terms of making oxygen for the environment, making glucose, making water, etc.
The two processes of cellular respiration and photosynthesis rely on the sun as one of the key factors of making them occur. One of the reactants need for photosynthesis to occur is light energy, it is produced by the sun. With the cloud of ash covering the sun, photosynthesis cannot happen.
The reactants needed for photosynthesis to occur is water, light energy, and carbon dioxide. Without light energy, photosynthesis cannot occur. Neither can cellular respiration because it relies on the products of photosynthesis for its process. ( Water and glucose) These two processes rely on each other and with this cloud of ask blocking the sun, life in the midwestern US would be very difficult.