The following figure is the phase diagram for water.

How is skating on ice, which is solid water, possible?

• A. When someone skates on ice, the skate blades apply heat on it, which causes it to melt, creating a layer of liquid that makes it possible to glide across the ice.
• B. When someone skates on ice, the skate blades apply pressure on it, which causes its melting point to decrease, melting some of it and creating a layer of liquid that makes it possible to glide across the ice.
• C. When someone skates on ice, the skate blades apply pressure on it, which causes its melting point to increase, melting some of it and creating a layer of liquid that makes it possible to glide across the ice.
• D. Cannot be determined