1) the pressure of the hydrogen gas increases and the gas reaches extreme temperatures
2) bare nuclei collide with each other due to massive amounts of heat
3) the colliding neuclei fuse to form larger helium atoms having two protons and two neutrons
4) hydrogen atoms shed their electrons
This could be wrong so don't fully trust this answer
Colliding boundaries are convergent so the boundary would be convergent.
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C. Fishing
I think fishing would make sense due to living in a river valley.
