Which elements consists of a metal a matalloid and a noble gas
1) aluminum, sulfur, argon
2) magnesium, sodium, sulfur
3)sodium, silicon, argon
4)silicon, phosphorus, chlorine

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.