I'm pretty sure it is refraction <span />
Explanation:
Fear is a barrier as people fear being judged for things as there might be a stigma attached to it. When people are judged their problem isn't solved and instead worsened and they will feel compelled to keep their problems to themselves.
Answer:
The weight of an object at the surface of a planet is proportional to the planet's mass and inversely proportional to the square of the radius of the planet.
Easy just get some water and get a cup and pow
