Vocabulary
From the side of...
What is lateral
March 16, 1980
What is the when the first sign of activity occured on the mountain.
On the morning of May 18 1980, this event triggered the eruption and landslide of Mt. St. Helens.
What is an earthquake.
This state is where Mt. St. Helens is located.
What is Washington.
TRUE or FALSE. Today, Mt. St. Helens is no longer considered an active volcano.
False!
The highest point of a volcano or mountain.
What is the summit
On March 24, 1980, this amount of earthquakes were recorded in only one hour.
What is 20 earthquakes.
This side of the mountain slid away as a huge landslide.
What is the northern side.
The mountain range that Mt. St. Helens is located.
What is The Cascade Mountain Range
It took this many weeks for ash to be seen around the globe.
What is 2 weeks.
A column of hot volcanic ash and gas emitted into the atmosphere.
What is a volcanic plume.
In the months of March and April 1980, hundreds of these events took place.
What are explosions.
The lateral blast caused a landslide to flow at this alarming speed.
What is 300 mph.
Who was the Volcanologist that announced over the radio, " Vancouver! Vancouver! THIS IS IT!"
Who is David A Johnston.
TRUE or FALSE. The Mt. St. Helens eruption has often been declared the most disastrous volcanic eruption in U.S. history.
TRUE
A dense, fast-moving flow of solidified lava pieces, volcanic ash, and hot gases.
What is pyroclastic flows.
Between May 7 and May 17 1980, more than 10,000 of this natural disaster occured and grew a massive bulge on the volcano.
What are earthquakes.
Massive winds blew millions of tons of this substance eastward across the United States.
What is ash.
The number of people killed by the eruption of Mt. St. Helens.
What is 57 people.
The large, bowl-shaped cavity that was created after the May 18 blast.
What is a crater.
Volcanic mudflow
What is a Lahar.
By May 17, 1980, it was evident that this substance had risen high into the volcano.
What is magma (molten rock)
The mayor of this town eventually threatened businesses with fines if they failed to remove the ash from their parking lots.
What is Portland, Oregon
The amount in feet (ft) that Mt. St. Helens was shortened by after the blast.
What is 1,311 feet.
TRUE or FALSE. Mt. St. Helens has not erupted since 1980.
FALSE.