What is the difference between chemical and physical properties and reactions

Physical properties are things that can be observed without changed what the item is, for example, you can cut down a tree and look at it, but it's still a tree.

Chemical properties are things you can observe by changing what the item is, staying on the subject of trees, you can burn a tree and it becomes something completely different - ash.

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.