E > A
Volcanic gases, including water vapor, are released into the atmosphere. We know that water vapor comes from ground water heated by magma because of the geysers at Yellowstone.

Particulate matter thrown into the atmosphere cuts down on the sunlight reaching Earth, just as heavy smoke pollution given off by industry does.

I think more rain will occur due to the increased particulate matter in the atmosphere as this increases condensation nuclei on which water droplets can form.

As in previous great eruptions, large quantities of dust and ash would be added to the atmosphere, and the dust could be carried in the upper winds and spread out in the upper troposphere. The additional dust added to the atmosphere could produce more brilliant sunrises and sunsets as it did after the eruption at Krakatoa in 1883.

E > B
The eruption would impact the biosphere by resulting in death for some animals and providing an opportunity for others. Death would come in many ways, including from the initial blast itself, the impact of falling material, burying/smothering/clogging by ash, burning, toxic gases, reduction in light, and encroachment of organisms "fleeing" into already populated areas.

Volcanic ash can be very rich in some cases and could enrich the lands around the blasted area as was seen after the 1980 Mt. St. Helen's eruption.

Animals outside the heavily hit ash areas would possibly suffer long- and short-term effects from inhaling and consuming the falling ash.

As with Mt. St. Helen's, the heat of the eruption would melt vast quantities of ice that would flow down existing stream valleys causing extensive flooding.

The hydrosphere is impacted primarily in two ways. The most obvious is that water bodies receive large amounts of volcanic ash and debris. The second is that the heat and wind generated, increases evaporation. Evaporation in combination with water vapor expelled by the volcano increases local rainfall.

E > L
The lithosphere is replenished by a volcanic eruption. A volcanic eruption is the active rearrangement of part of the lithosphere. Volcanic material is jettisoned to the surrounding countryside resulting in the deposition of volcanic ash and pieces of the mountain itself onto the surrounding topsoil.

As with Pinatubo, large amounts of ash and dust would accumulate on the land surrounding the volcano.

L > E
A volcanic eruption is part of the lithosphere. Tectonic plate interactions are behind the volatile nature of the lithosphere and the cause of volcanic eruptions.

Before and during an eruption, seismic activity increases. Earthquakes are common, often coming in swarms. An earthquake was thought to cause the landslide that caused the Mt. St. Helen's eruption of 1980.

A > B
Carbon dioxide and sulfur dioxide may lead to acid rain. Increased acidity can act as a mechanism to ruin plant growth as well as life in surrounding rivers, streams, and ponds.

Plants are coated with ash and are unable to use what sunlight does get through to them.

Animals ingest a large amount of ash causing unknown harm to them. The smoke and fine ash particles in the air coat animals' lungs and decrease their O₂ supply, which may already be decreased because of fires consuming atmospheric O₂ and the increased amounts of CO₂.

Toxic gases released by the volcano and possibly a local decrease in oxygen concentration may result in death.

A > H
The hydrologic cycle would temporarily increase. Heating of the atmosphere by the eruption would result in increased evaporation. Eventually water vapor from evaporation and from the volcano would fall as sulfuric acid rain due to sulfides expelled during the eruption.

There would probably be increased rain down wind because of increased particles and increased evaporation from volcanic heat near the volcano.

Falling ash and acid rain could cause a change in the pH of surface water and possibly the groundwater.

A > L
There will be more erosion because of increased rainfall, such as the mudslides in California that resulted from the excessive rain of El Niño.

Winds could cause the blowing and drifting of ash as it does with sand or snow.

H > B
Additional flows of sediment-laden water could continue to rebury new plants that start to grow.

Life depends on water. With the water containing ash, the remaining animals will have little to drink.

B > L
The lithosphere will be impacted as old growth forests are swept away in the flood waters, exposing fragile soils that will then rapidly erode.

With the limited amount of vegetation remaining after the blast, potential erosion could take place.

L > B
Ash is added to the topsoil and increases fertility. I notice that many crops are grown on the sides of volcanoes because of the rich soil.

L > H
There will be increased turbidity in streams and lakes as eroded material is deposited. Erosion deposits changed the creek near my house to a more pond-like environment.

The erosion deposits may change the chemical composition of the water, just as dumping pollutes the water.

Continued volcanic activity would continue the melting of nearby glaciers, resulting in increased runoff.

The steep terrain around the volcano would cause heavy runoff and less water getting into the ground water. As some stream valleys become filled with sediment, new stream values would form, further altering the landscape.

A > H > B
Carbon dioxide and sulfur dioxide may lead to acid rain by 
combining with water vapor in the atmosphere. Increased acidity can act as a mechanism to ruin plant growth along with life in surrounding rivers, streams, and ponds.

A > H > B
Carbon dioxide and sulfur dioxide may lead to acid rain by 
combining with water vapor in the atmosphere. Increased acidity can act as a mechanism to ruin plant growth along with life in surrounding rivers, streams, and ponds.

A > L > B
Ash clouds consisting with tephra (jagged pumice, rock fragments and bits of glass) are carried by prevailing winds and deposited as ash fall. Ash fall can bury whole cities, like it did Pompeii and Herculaneum.

B > H > B
The death of plants and animals in the lakes and rivers causes an increase in organic material, which causes an increase in bacteria and a further decrease in O₂ and a chain reaction of aquatic animal deaths.

H > A > L
Water vapor emitted from the volcano can be precipitated in heavy, intense rain on the flanks of the volcano, which mixes with loose ash, creating massive mud flows. The mud flows mobilize any loose debris as well, forming lahars.

L > H > B
Tephra deposits can cover the ground around the volcano for hundreds of miles in diminishing depths further from the eruption. These deposits, and later erosion from their combination with water runoff, have the potential to scour fertile soil from farm and range lands, damaging their ability to support food and grazing crops. 

E > H > L > B
As with Mt. St. Helen's, the heat of the eruption would melt vast quantities of ice. During the pre-eruption of a snowcapped mountain, a noticeable meltdown of the snow due to the increase in internal heat occurs. This meltdown will increase the water flow into small streams, creeks, and rivers. As the snow cover continues to melt, it eventually will pick up more dirt, mud, and debris from the runoff. The larger the amount of ice available to melt, the larger the potential mud flow that wipes out living things in its path.

E > L > A > H > B 
Tephra, or volcanic ash, will be carried downwind and will fall to produce a deposit that covers a broad area, including rivers, streams, and oceans. The resulting silt will affect turbidity and oxygen-carbon dioxide cycles. This in turn will affect the biosphere and lithosphere as the silt filters through and is deposited on the ocean bottom. 

• http://www.uvi.edu/coral.reefer/threats.htm

• http://vulcan.wr.usgs.gov/Volcanoes/Rainier
  /Hazards/OFR98-428/introduction.html