20.Which of these is a way in which elementsand compounds are similar A. Elements and compounds are both pure substances.
B. Elements and compounds are both listed on the periodic table.
C. Elements and compounds are both made up of different kinds of atoms.
D. Elements and compounds can both be broken down by physical changes.

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

< 3

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.

there is none because earth is stationary and flat.