Crtitical Support Broken in Google, Further Sell Off Possibility

Today Google decline $24 or 4.5% and finally broke its major support at $520.  Now that Google has successfully declined below its support, it is headed much lower.  In looking at a three
 year chart, there seems to be a strong support around $470 level.  If market continues to decline tomorrow and rest of this week, we should see Google reaching this next support soon.  However, since $520 represents key resistance, I expect Google to retrace back towards this range prior to further decline.