In 1980, the geographic entity that shrunk more than 1300 feet was the summit of Mount St. Helens in the state of Washington, USA. The volcano, known for its catastrophic eruption in May of that year, lost a significant portion of its elevation due to the massive explosion that occurred. The eruption caused the top of the mountain to collapse, resulting in a dramatic reduction in height.

This event had a lasting impact on the surrounding area, as the eruption also led to the destruction of nearby forests and the formation of a large crater at the summit of the volcano. The landscape was forever changed, and the effects of the eruption are still visible today, with the volcano's peak standing at a lower elevation than before the eruption.

The eruption of Mount St. Helens in 1980 was one of the most significant volcanic events in recent history, and it serves as a reminder of the power and unpredictability of nature. The shrinking of the summit by more than 1300 feet was a stark demonstration of the force of the eruption and the immense scale of the destruction it caused.

Today, Mount St. Helens is a popular tourist destination, with visitors coming from around the world to see the volcano and learn about its history. The volcano continues to be monitored closely by scientists, who study its activity and work to better understand the processes that led to the 1980 eruption.

In conclusion, the shrinking of Mount St. Helens' summit by more than 1300 feet in 1980 was a dramatic and significant event that had far-reaching impacts on the surrounding area. The eruption of the volcano was a powerful reminder of the forces at work beneath the Earth's surface, and it continues to be studied and remembered to this day.

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