Sprint finishes decide cross-country medals
World champions Norway broke away in the final straight to secure the cross country team sprint title after two top teams failed to reach the final.
Defending champions Sweden were eighth in their semi-final after Teodor Peterson slipped and broken a ski pole.
And Leanid Karneyenka of Belarus took a wrong turn in the final few metres of his semi-final, while in the lead.
Germany's Axel Teichmann led the final going into the last bend but Petter Northug powered past to secure gold.
Teichmann survived a photo finish to hold on to silver ahead of Russia, and make partner Tim Tscharnke the youngest ever male medallist in Olympic cross-country skiing, at 20 years and 71 days.
Northug, 24, won three gold medals at last year's World Championships but failed to live up to expectations in his first three events at the Games.
I've got an experience that no else of my age in the world has got and that's definitely stands our team in good stead
He was 41st in the men's 15km freestyle, won bronze in the individual sprint and finished 11th in the 30km pursuit after breaking his pole in a collision.
But he was well set up by partner Oeystein Pettersen and, having crossed the line in first place, slid to the ground and punched his right fist in celebration.
"I wanted this medal. It's been a little bit up and down here so now I have the gold medal I am really happy."
Veteran Teichman said: "All I can say is that I did my best and we came in second - and we are happy about that."
did not finish their semi-final as Young had a cold and was feeling low on energy ahead of the last leg.
"It's been a bit frustrating as I didn't perform as well as I should have in the 15km," said Young.
"And I was having the best race of my life in the sprint before I crashed.
"But I've got an experience that no else of my age in the world has got and that's definitely stands our team in good stead for future competitions."
Musgrave, 19, said: "It's been awesome being here. I'm going to go into next year pretty confident I can make the next step up and make the jump to senior level."