Consider the 3 × 2 contingency table below. 
Compute the expected frequencies in row 1.
Definitions:
Tectonics
The study of the structure and motion of the Earth's crust and its large-scale processes and features.
Structural Features
The various physical shapes, formations, or attributes that make up an area or object, especially relating to geology.
Volcanic Eruptions
Explosive events where magma, ash, and gases are expelled from a volcano.
Materials
Substances or components with specific physical and chemical properties, used in the construction or manufacturing of objects.
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