Question

1. mount st. helens erupted in 1980. magma chambers pressure caused a massive eruption. ash clouds rose 15 miles high, wildlife habitats were destroyed, and debris clogged rivers. as described above, which spheres were affected?

o biosphere, hydrosphere only
o atmosphere, hydrosphere, geosphere only
o atmosphere, biosphere, atmosphere only
o geosphere, hydrosphere, atmosphere, biosphere only

question 4

which of the following is evidence of seafloor spreading?
o presence of deep - sea trenches.
o magnetic striping patterns on the ocean floor.
o formation of island chains.
o mountain ranges on continents.

Explanation:

For the first question, the magma - related activity involves the geosphere. The ash clouds rising into the air affect the atmosphere. The destruction of wildlife habitats impacts the biosphere, and the debris clogging rivers affects the hydrosphere. For the second question, magnetic striping patterns on the ocean floor are a key evidence of seafloor spreading as they show the alternating magnetic polarity as new oceanic crust is formed.

Answer:

1. Geosphere, Hydrosphere, Atmosphere, Biosphere only
2. Magnetic striping patterns on the ocean floor.