Stock markets slid across the board on Tuesday as investors worried about lofty tech valuations on the eve of earnings from AI chip titan Nvidia.

Bitcoin also briefly fell below the key $90,000 level for the first time in seven months before rising to around $93,000.

Major Wall Street indexes closed lower after a rough day of trading in Europe and a sharp sell-off in Asia, while Nvidia itself gave up 2.8 percent.

"The tech-focused sell-off seen in the US has evidently resulted in global contagion," said Joshua Mahony, chief market analyst at Scope Markets.

In an interview with the BBC released Tuesday, the head of Google's parent company Alphabet -- Sundar Pichai -- warned that every company would be impacted if the AI bubble were to burst.

Fawad Razaqzada, market analyst with StoneX,

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