Although rates of glacial movement vary from region to region, on average the antarctic ice sheet moves

The answer is: at a rate between 2 meters (6.5 feet) and 800 meters (2600 feet) per year

There are several factors that can influence these movement, including factors such as currents, global temperature, gravity, etc. Due to the combination of these various factors, currently the antarctic ice sheet has lost around 20,800 square miles of sea ice per year,

sorghum farming likely spread with the bantu migration. there is your answer i had to get it wrong to get this right so i hope ya'll enjoy!

answer conditional instability;