An ice sheet is defined a mass of glacial land that extends more than 50,000 sq km (19,300 sq mi) across a land. There are only 2 ice sheets on Earth today: the Greenland and Antarctic Ice Sheets. Learn more: bit.ly/3Y8SoOM National Snow and Ice Data Center Mission Antarctica by @MissionAntarctica A @grttme project - Other backups: @Hallotme