Resources for Synthetic Materials Practice Test

Many farmers use synthetic fertilizers to help crops grow. One major step is using natural gas to make ammonia, which is then turned into fertilizer products. Which natural resource is most directly used to produce the ammonia for many synthetic fertilizers?

Farmers often use synthetic fertilizers to help crops grow because fertilizers provide concentrated nutrients. One key step is using a fossil fuel to make ammonia, which is then used to make many nitrogen fertilizers. Which natural resource is most directly used to make ammonia for synthetic fertilizers?