1. Earth Science Introduction
Grade 6

2. Use these words in your sentence descriptions
Gas
Lava
Magma
Flow
Land
Plates
Water
Cool temperature
Hot temperature
Pollution

3. Gas- a state of matter where particles move quickly and are far apart from each other
Lava- hot, molten rock found on the outside of a volcano
Magma- hot, molten rock found on the inside of a volcano
Flow- the speed at which lava moves. Flow rate depends on the thickness of the lava
Land- solid pieces that make up the earth’s surface
Plates- pieces of earth’s crust that move to create landforms and land activity
Water- non-living substance that will provide cooling when it hits lava
Cool temperature- this decrease in heat will cause lava flow to slow down
Hot temperature- this increase in heat will cause the lava flow to speed up
Pollution- tiny specs of smoke, rock, ash and debris that is found in the clouds of air after a volcanic eruption

5. 1857-1980 - Mount St. Helens is inactive.
May 18, :32 am PDT - Mount St. Helens erupts!
The eruption blows off more than 1,000 feet from the top of the mountain, leaving a huge crater. The mountain had been known for its snow-capped peak, earning the nickname "the Fuji of America" for its resemblance to Japan's Mount Fuji.
Fifty-seven people are killed. Damage caused by the blast costs $1.1 billion (USGS).
Hot ash causes forest fires, and snow melt from the top of the mountain causes floods.
Volcanic ash spreads across the Northwest. More than 900,000 tons of ash are cleaned up from areas around Washington state.
The 1980 eruption is the first eruption in the continental United States outside of Alaska since 1917.

6. 1980-1986 - Many small eruptions occur.
October Sixteen "dome-building" eruptions build up the dome in the center of the crater.
Oct. 1, Mount St. Helens begins blowing a large cloud of smoke and steam on a Friday afternoon following a week in which scientists have closely monitored the volcano. Officials placed the region around the mountain on a volcanic advisory
Fall Several days of unusual seismic activity lead seismologists to believe that an explosion resulting from steam buildup is likely to occur.
March 8, Mount St. Helens releases a column of smoke and ash nearly six miles high, leaving a plume visible for more than 50 miles. .
Here is Mt St Helen during eruption 1980