About 98% of Antarctica is covered by the Antarctic ice sheet, a sheet of ice averaging at least 1.6 km (1.0 mi) thick. The continent has about 90% of the world's ice (and thereby about 70% of the world's fresh water). If all of this ice were melted, sea levels would rise about 60 m (200 ft). In most of the interior of the continent, precipitation is very low, down to 20 mm (0.8 in) per year; in a few "blue ice" areas precipitation is lower than mass loss by sublimation and so the local mass balance is negative. In the dry valleys, the same effect occurs over a rock base, leading to a desiccated landscape.
About 98 % of Antarctica is covered by the Antarctic ice sheet , a sheet of ice averaging at least 1.6 km ( 1.0 mi ) thick . The continent has about 90 % of the world 's ice ( and thereby about 70 % of the world 's fresh water ) . If all of this ice were melted , sea levels would rise about 60 m ( 200 ft ) . In most of the interior of the continent , precipitation is very low , down to 20 mm ( 0.8 in ) per year ; in a few " blue ice " areas precipitation is lower than mass loss by sublimation and so the local mass balance is negative . In the dry valleys , the same effect occurs over a rock base , leading to a desiccated landscape .
How much of Earth's ice is in Antarctica?
How much of Earth 's ice is in Antarctica ?
90%
90%