a layer of ice permanently covering parts of the earth, especially around the North and South Poles
ice cap /ˈaɪs kæp/
to stop holding something or stop it from being held so that it can move, fly, fall, etc. freely
release /rɪˈliːs/
a situation when there is not enough of the people or things that are needed
shortage /ˈʃɔːrtɪdʒ/
