The correct answer is B; acidic clouds.
Further Explanation:
Acidic clouds are the reason for the defoliation of the evergreen trees. The clouds produces a mist that hits the trees. This causes the calcium leeching process to start. Once this process starts, the needles start to freeze and thus kills off the needles.
The new needles that start to come in and replace the dead/frozen ones will then die before every getting to reach full growth. This causes the tree tops to die.
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Answer:
The answer is B/Acidic Clouds
Explanation:
High altitude defoliation of evergreen trees is attributed to the presence of acidic clouds. The acidic cloud mist causes calcium leeching which in turn causes freezing damage in current needle growth. Simply put, the new needles die.
