eli5: Why does sand which is a bunch of tiny rocks, turn into glass, but we can’t turn big rocks into glass?

Question

I’m very tired. Please help me understand this.

In: Other

Answer 1

You could, it’s just not efficient to do so… think of how quickly a handful of snow would melt indoors vs. a solid block of ice that fits in your hand. Same idea for turning sand to glass vs. larger rocks.