Q: As a polycrystalline material solidifies, grains with irregular shapes form. the interfaces between grains constitute grain what?


Read this paragraph and choose the correct option from the provided answers:

Grain boundaries. As a polycrystalline material solidifies, grains with irregular shapes form. The interfaces between grains constitute grain boundaries. (Squares represent unit cells within grains.

 Choices:

- waves

- patterns

- obstacles

- boundaries


A:
boundaries