Guys help me pls Which of type of elements are mainly gases at room temperature, dull and
brittle with low melting points?

The types of elements that are mainly gases at room temperature, dull and brittle with low melting points is possibly nonmentals.

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.