I think is alternative a because that includes the earth
P waves is moved by compressing and expanding.
S waves is form perpendicular angle when they pass.
Everybody always uses it to mean some kind of liquid that's hot and smoking,
like glowing smoking molten lava creeping down the sides of a volcano, or red
hot molten steel pouring out of the furnace in a steel mill in a shower of sparks.
But I think technically it just means melted ... water is molten ice.
(-3, -2) I believe it should be
