During the last 5 million years, how often have the poles reversed themselves? 10

20

15

5
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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.

28528289 29823282 8298232 39858

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2