Question: How can you use codes on computers to see how chemicals affect land?

Cat Scott ? answered on 7 Mar 2016:

If you stand outside and look up into the air towards the clouds (**but not directly at the Sun!**), then imagine that all the air above you is divided up into invisible boxes.

In each of those boxes there are loads of chemical reactions and complicated processes happening. It’s different in each box because they all contain different things, and some are closer to the ground, whereas some of them are up in the clouds. It’s too complicated to try and keep track of all these different things in your head, so we have to use computer programs to remember all the information and perform the calculations.

So, the things that happen in a box that is over a forest, will be different to a box that is over a city, or the desert. In a box over a forest, we have the gases coming out of the trees, but in a box over a city we have pollution from cars and factories.