Which equation represents natural transmutation? A. B+ He → N+in
B. "C"N+ de
C. S +2e → S-
D. Na → Na* + e"

) Na -> Na^+ +e) you need to balance the number of electrons, so multiply B x 2 (B) (2Na -> 2Na^+ +2e)

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

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.