What physical phenomenon is reflected in the following riddles? a) Before us – upside down, Before you – upside down.

What physical phenomenon is reflected in the following riddles?
a) Before us – upside down, Before you – upside down.
b) When is the sky below the earth?

a) Reflection in water; b) when reflected in water.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.