Market volatility is picking up again, with major sell-offs in many top stocks. Tesla (NASDAQ: TSLA) and Cognex (NASDAQ: CGNX) have plummeted in recent weeks, while Plug Power (NASDAQ: PLUG) continues its multiyear downtrend.

Here's what's driving the sell-off in these growth stocks and whether they are worth buying on the dip.

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Source Fool.com