no
no
The river Nile does not have any special features.
blue or red
no there are no special features found on mars...
Yes, it is cratered like the moon but is very dense.
yes
yes it does have special features
Yes.
no there are not.
yes they have craters,but that is all
Most notably that it is a liquid at room temperature. It is important to be very careful handling mercury, because it is very toxic.