Question

Which is greater 10 L or 1000 ML

Answer 1

I am assuming you mean mL. So milliliters.
Milli is the thousandths.  
1,000 milliliters is 1 liter.
That would mean that 10L is greater than 1,00mL.

Hope this helps!

Answer 2

10 L is greater. 1000 mL would be 1 liter.