Click and drag answers to change the order, or select using ↹ Tab then move by pressing Space and the ↑ ↓ arrows on your keyboard.
change of state from a gas to a liquid
change of state from a solid to a liquid
change of state from a liquid to a solid
change of state from a liquid to a gas
To pick up a draggable item, press the space bar.
While dragging, use the arrow keys to move the item.
Press space again to drop the item in its new position, or press escape to cancel.