When did plate tectonics begin?

[juvenissun]

You don't understand the value of basic research

You do. So please tell me what does it mean to basic research, 3.5 Ga or 3.5 Ma?
I guess. it would make no difference to you, basic or not basic.

 

[Ophiolite]

Does it matter?
3.5 Ga or 3.5 Ma, what difference does it make?

3,496.5 million years.

 

[AV1611VET]

Does it matter?
3.5 Ga or 3.5 Ma, what difference does it make?

Just move the decimal point where it's needed.