The formation of amber goes through two stages () and (), among which the necessary conditions are () and (

The formation of amber goes through two stages (turpentine forming turpentine balls) and (turpentine balls forming amber).

In these two processes, the necessary conditions are (hot weather), (pine trees are old), (turpentine just covers spiders and flies), (turpentine balls become), (crustal changes), (turpentine balls are buried under the sea sand for a long time) and (become fossils), so this is really a strange amber.