ECONOMIC TARNISH: Copper fell 2.5 percent after China said its first-quarter economic growth slowed and worries lingered about Europe's financial problems. It was the fourth drop this week.
CHINA'S IMPACT: Slower growth in China, the world's second-biggest economy, can have a ripple effect around the globe because it could mean weaker demand for commodities. China is a huge importer of commodities.
WIDESPREAD DECLINES: Prices for gold, industrial metals, oil, grains and beans fell. Heating oil rose.