Environmental seal on Nikon D90?

My friend and I were talking cameras, and he wants to buy a D90.
He asked me about the environmental sealing on my camera and the D90.
I've got a D300s but I don't know how it is on the D90.
Could someone compare the two? JUST on environmental sealing, nothing else is necessary. I'm curious.

All advanced cameras like the D90, D7000, D300, D300s, D700 and D3 series cameras have environmental sealing.

I'm sure if you call Nikon, you can get some resources from them if you really need a further explanation.

Me? I just use my cameras and protect them as much as possible from rain, moisture, dust and other damaging factors

I think the Ace is wrong, i'm 99% sure the D90 is not sealed. That starts with the D300.

Ace *is* wrong. The D90 is not weather sealed in any way. Such sealing begins with the D300.