While playing soccer, carla slides across one of the lines on the field. when she stands up, what base does she dust off? calcium hydroxide ammonium hydroxide zinc hydroxide potassium hydroxide

Option A, Calcium hydroxide

Explanation:

Sports pitches are regularly marked with the chalk and limestone. However, in earlier sports events,  wood shavings and dust were also used.  

Since most of these sports are played on grass surfaces, marking through lime has proved much convenient than other materials.  

Chalk and limestone materials or hydrated lime (CaOH) is crushed into powder form and used for marking the pitches. Since it is white in color, it could easily reflect the light  and hence produces good  visibility.

Hence, option A is correct

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave