The picture given here shows part of a skating track inside a campus. Children who are roller-skating come from both directions as shown by the arrows. Children coming in opposite directions often bang into each other at some point(s) because they are not able to see through the thick bushes and trees on either side of the path. At which point(s) is this MOST likely to happen?

specific latent heat of fusion, lf, of a substance is defined as the amount of heat required to change a unit mass of the substance from solid to liquid state, without any change in the temperature.

explanation:

it breaks and dirupture other materials and other sencews from the bottom

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

3. dark matter

empty space could also be a simple vacuum