How valuable is Vietnam's topography (forests and mountains) in the history of the resistance war against the enemy?

it was very valuable

Explanation:

vietnam partook in guerilla warfare which is mostly done in hiding in forest and using your enemies blind spots to your advantage

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.