The speed of sound is greater in hot air than it is in cold air. This is because the molecules of air are moving faster and the vibrations of the sound wave can therefore be transmitted faster. This means that when sound travels from hot air to cold air or from cold air to hot air it will refract.
The idea that males and females of approximately equal physical attractiveness are likely to select each other as partners refers to the Matching hypothesis.
In the field of social psychology, the idea that people are more likely to form successful relationships with and express liking for people whole level of physical attractiveness roughly equals their own.
A good example is. A man of average attractiveness goes on one date with an extremely attractive person, and then another with an average-looking person. He finds he likes the average-looking date more.
Below 50 meters, the ice now behaves in a ductile manner rather than a brittle manner, meaning it will stretch and fold under stress rather than fracturing.
:D
If I remember from when I did this then I'm pretty sure it's B
I'm not a 100% sure if I'm correct but I think I might be.