CANADA STOCKS-TSX advances as natural resource shares rise

* TSX up 101.79 points, or 0.71 percent, at 14,439.56 * Nine of 10 main index sectors advance * CP Rail jumps after reporting quarterly results By John Tilak TORONTO, Oct 21 (Reuters) - Canada's main stock index climbed for a fourth straight session on Tuesday as natural resource shares rose on the back of higher commodity prices and investors digested data showing slower yet better-than-expected economic growth in China. China's economy expanded in the September quarter at