Now zoom out to ∼4000 miles eye altitude and look at the...

Now zoom out to $\sim 4000$ miles eye altitude and look at the chain of Hawaiian Islands again. Notice the chain continues for thousands of miles up to Aleutian Islands (between Alaska and Siberia). Examine the northernmost sunken volcano $(504916.99 \mathrm{~N} 1671636.12 \mathrm{E})$ in this chain. Where was that volcano located when it was still active, erupting, and above the surface of the ocean? a. $504916.99 \mathrm{~N} 1671636.12 \mathrm{E}$ b $523148.72 \mathrm{~N} 1662543.14 \mathrm{~W}$ c. $274549.27 \mathrm{~N} 1771008.75 \mathrm{~W}$ d. $192815.23 \mathrm{~N} 1551914.43 \mathrm{~W}$

Now zoom out to $\sim 4000$ miles eye altitude and look at the chain of Hawaiian Islands again. Notice the chain continues for thousands of miles up to Aleutian Islands (between Alaska and Siberia). Examine the northernmost sunken volcano $(504916.99 \mathrm{~N} 1671636.12 \mathrm{E})$ in this chain. Where was that volcano located when it was still active, erupting, and above the surface of the ocean?
a. $504916.99 \mathrm{~N} 1671636.12 \mathrm{E}$
b $523148.72 \mathrm{~N} 1662543.14 \mathrm{~W}$
c. $274549.27 \mathrm{~N} 1771008.75 \mathrm{~W}$
d. $192815.23 \mathrm{~N} 1551914.43 \mathrm{~W}$

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Key Concepts

Hotspot Volcanism

Hotspot volcanism refers to the creation of volcanoes when a tectonic plate moves over a relatively stationary plume of hot mantle material. This process forms a chain of volcanic islands or seamounts over time, with the location of volcanic activity shifting as the plate continues its movement over the fixed hotspot.

Plate Tectonics

Plate tectonics is the theory describing the large-scale movement of Earth's lithospheric plates. As plates move, volcanic features that were once above sea level can drift and eventually subside, which explains why a volcano's current, paleopositional coordinates may differ from where it erupted when it was active.

Seamount Chain Evolution

Seamount chain evolution involves the formation, growth, and eventual eventual subsidence of volcanic features over geological timescales. The progressive movement of the tectonic plate carrying a volcano away from its hotspot leads to changes in its position relative to current coordinate systems, making reconstruction of its original location an essential part of understanding its history.

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