Dr.MisterDoctorDoc

   Someone asked a question in second period. They asked if you can suffocate your lungs from breathing in to much Helium. You 'can' die from to much Helium because, you are not getting enough Oxygen.

   It doesn't always kill you. Sometimes you just pass out. That can also be very dangerous, because it can give you brain damage.

   Another way it can kill you is breathing it from a pressurized tank. It makes your lungs fill up with air quickly. If your lungs fill up to quickly your lungs can explode.

What is Galena? Dr. Ali

Galena is a mineral made of lead.It has sulfur. Galena is made of lead such as bullets,batteries,gasoline,paint,welding solder.The mineral galena is a compound.  Some galena may contain up to 1% of silver.  A bluish, gray,black mineral of metallic appearance, consisting of lead sulfide. It is the chief ore of lead.