Only the top layer of water freezes in a lake because this layer insulates the rest of the water but the water in a trough in a freezer freezes all the way through. Why?

Question

Only the top layer of water freezes in a lake because this layer insulates the rest of the water but the water in a trough in a freezer freezes all the way through. Why?

In: 4

Answer 1

Because is not in contact with the ground, or any warmer/insulated surface. In other words, the water in the freezer is loosing heat all around, not just the top.