What happens when a business achieves an economy of scale

, economies of scale are said to be achieved. Alternatively, this means that as a company grows and production units increase, a company will have a better chance to decrease its costs

that is correct.

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.