Which of the following is incorrect regarding research at Dome C?
◦ Ice cores record climates as far back as 800,000 years.
◦ The ice is 3309 m (10,856 ft) deep there.
◦ The ice from MIS 11 is of great value due to the similarities to the present.
◦ The ice core record contains several periods with CO2 levels twice as high as current levels.