Explain the reason that maps must change over time

Explanation:

Because the place on the map can be changed to another shape by natural effects like faulting,folding , volcanism

Maps must change over time as the geographical structures change from time o time. The roads and highways also change often due to the development activities .

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.