Ok, science fans

[ShadowsPapa]

No fair cheating - don't use Google. Use your middle school or high school science class knowledge and explain what you see here (I already know what it is)
This pretty much only happens with water that is pretty clean, not often with tap water.

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[WestwallNF104A]

How detailed do you want? The top freezes first, then the spike forms because as water freezes it expands.

So long as you have liquid water it will grow.

I have found that our tap water is pretty clean so if I set the freezer low they will form.

 

[Chadp82]

The ice got excited. The kind of excited when a teenager in the 90s watched Pamela Anderson in baywatch.

 

[ShadowsPapa]

How detailed do you want? The top freezes first, then the spike forms because as water freezes it expands.

So long as you have liquid water it will grow.

I have found that our tap water is pretty clean so if I set the freezer low they will form.

Yes. And it freezes edges first so it has to expand up through that final hole, often forming an ice tube.

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