Isaiah puts a 10 gram weight on a pan. how many 1 gram weight does he need to balance the scale

To balance the scale,  you need to have the same weight as both sides. So you need total 10 grams to balance which is also ten 1 gram weight.

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.

The kinetic energy of the liquid increases. hope this !