9. If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis?

There is a picture but I cant upload it. Please help me!

The answer is that when the line reaches zero on the horizontal axis then there will be little left of the Isotope. This, in turn, means that it will keep getting smaller but never stop existing. I know, when my dad explained it to me it sounded complex but it basically means that it will keep getting smaller until it is not able to be distinguished between none and little to none.

If you are really still struggling I suggest you watch a brain pop about this and look over your lesson. Hope this helps.

I'm on this question rn.. assuming you go to connections academy too?

AHHH I'VE BEEN WORKING ON THIS QUIZ FOR 30 MINUTES IM SO TIRED

btw don't say the exact same thing that Hate Ms Sue too said. just make sure to change it up enough so that they can't tell it's the exact same thing

I have the same question. Does anyone know the answer?

More than 30 min :/

This generation is messed up

The basic answers to the quiz are

8. cast fossils are created from mold fossils, which makes them related
9. at 0 years the rock was formed. you know this because the percent of readioactive element remaining is at 100 and 0 years have passed.
10. you can conclude that the clam was burried by waves on the shore, and became a fossil after the sand turned to stone.
There are a lot of typos, and make sure to reword the whole thing, and add details, cause these answers are very vague, and may not get you full points. However, they are correct.

I have the answer for yall though, The event is the formation of the rock.

Aka- How the process starts.

Same I rlly need help