What does the line of blue triangles mean on a weather map?

a warm front

a cold front

a stationary front

an occluded front

It represents a cold front corespondent to its color

Hope this helps!!

B. a cold front

Explanation: Blue triangles represent a cold front advancing in the direction of the triangles, as cooler air displaces warmer air upwards. Red semicircles are a warm front, where warmer air pushes the cooler air away.

passing a magnet thought the

mixture , because iron gets attracted to magnet .

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml