You spend them on research projects for upgrades. After you recruit Mordin Solus, the scientist, you can access the tech part of your ship and spend resources on upgrades.
The SSV Normandy in Mass Effect The Normandy SR-2 in Mass Effect 2 & 3
There is an online Mass Effect Wiki that contains the full list of planets and their contents.
It will start using your minerals. Not sure what happens if you run out of those.
The airlock plays no part in the Mass Effect series after the first game. It merely serves as an aesthetic.
You use the cross-hair.
If he died in Mass Effect 1 then he is not in Mass Effect 2. If he survived Mass Effect 1 he shows up in Mass Effect 2 but he can not be killed.
You can compare the density of two different minerals by measuring their mass and volume. The formula to calculate density is density = mass/volume. Once you have these measurements, you can compare the densities of the two minerals to determine which one is denser.
If by not importing correctly you mean that your Shepard's face is not what it was from Mass Effect and Mass Effect 2? This issue is encountered with people who attempt to import a Shepard that they have played through both of the first games with. The reason for this error is that because Mass Effect did not use the same coding system that Mass Effect 2 & 3 use, the game is unable to generate an accurate render of the imported Shepard's face, often resulting in a Shepard of completely different appearance.
The effect of mass extinction is extinction, death of a mass
Yes, there will be a Mass effect 3. even if your Shepard died, there will be a mass effect 3.
mass effect 2 will be
BioWare, the developer of Mass Effect has confermed Mass Effect 2 to come out in 2010.