Answer:
Before Mount Everest was discovered what was the highest mountain on Earth?
I am black when you buy me red when you use me when I turn white you know itβs time to throw me away.
My first half means container. Not a lot of people understand my language.
I am used when you jump off a bridge for fun.
I come with a train and go with a train and the train doesn't need me but can't go without me.
What scientists might call your pooch.