Which consists of only one type of atom a pure substance
a mixture
a compound
an element​

an element

Explanation:

elements like iron or copper consist of only one type

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

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.