The diagram below represents changes in the types of plants growing in the same area during four different time periods. Different types of plants have been labeled for each time period. oo
Hardwood trees
Softwood trees
Small plants and
shrubs
Grasses
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Time
This change in plant types over time is an example of

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .