Question

directions: select each correct answer. more than one answer may be correct.
all plants need nitrogen to survive, but it is naturally available to them in only limited supplies. in 1909, engineers developed a process to make nitrogen available to plants by synthetically producing the chemical ammonia. once produced, ammonia could be used as a fertilizer for crops around the world thanks to its nitrogen content.
the process that the engineers developed is still used today. it makes use of the reaction between nitrogen gas and hydrogen gas at very high pressures. nitrogen gas is the most abundant gas in the atmosphere and is widely available. hydrogen gas needs to be made from the methane found in natural gas. natural gas is a fossil fuel that can be extracted from underground reserves.
what natural resources are used to make ammonia fertilizers?

• hydrogen gas
• atmospheric nitrogen
• natural gas
• ammonia

Explanation:

The question asks for natural resources used to make ammonia fertilizers. The text states nitrogen gas (from atmosphere, a natural resource) reacts with hydrogen gas, which is made from methane in natural gas (a fossil fuel/natural resource). Hydrogen gas is a derived product, not a natural resource directly used. Ammonia is the end product, not a resource. So atmospheric nitrogen and natural gas are natural resources.

Answer:

B. atmospheric nitrogen, C. natural gas