SINGAPORE _ Oil prices rebounded to around $90 Tuesday in Asia after plunging to an eight-month low Monday on concerns a significant slowdown in global economic growth will undermine demand for crude.Prices have moved so far, so fast, said David Moore, commodity strategist at Commonwealth Bank of Australia in Sydney. I certainly wouldn`t say the bounce today is indicative that we`ve reached a bottom in oil prices.Light, sweet crude for November delivery was up $2.05 to $89.89 a barrel in electro