Stocks are sinking, with the Nasdaq now in a bear market. Here are 4 things to know

Traders work on the floor of the New York Stock Exchange at the opening bell on February 22 2in New York. Stocks tumbled on Thursday after Russia invaded Ukraine, sending the Nasdaq into what's known as a bear market.

Timothy A. Clary / Timothy A. Clary

Stocks slumped on Thursday after Russia invaded Ukraine, sending the Nasdaq index into what’s known as a “bear market.”

The Dow Jones Industrial Average dropped more than 700 points, or 2.2%, while the S&P 500 fell 1.6% as of mid-morning trading.

The Nasdaq, which is heavily made up of technology companies, fell 1%, after earlier entering a bear market.