As the building collapses, the volume of air inside the building decreases, while the mass of the air stays the same. This means that the of the air inside the building will increase.

density I believe, air gets compressed when In pressure, so the air would have more density

radiation warms things up temp rises convection currents air circ windy weather

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.