In a laboratory experiment, john uses a mesh to separate soil particles from water. which technique of separation is he using?

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.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )