Help me please !! I’ll mark brain list :)

I dissagree, diamonds are not forever. Some may say that they are, but nothing is forever. Diamonds can be damaged with other diamonds. Diamonds can't be destroyed by anything other than another diamond. Others may beleive that Diamonds are forever because they do not have many things that can damage them, but they do still have one thing that can. Which like I said before, is diamond.

Explanation:

Diamonds are almost completely scratch proof and are one of the gemstones able to withstand abuse from just about every other material – with the exception of another diamond of course. The reason for this super strength is that diamonds top the scale of gemstone hardness.

I'm sorry if this didn't help :( I tried to help you.

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.