{$mEDiAurl} inDiCAtE whEthEr EACh oF thE Following is mEntionED in thE lECturE As A FEAturE oF pErmAFrost.CliCk in thE CorrECt Box For EACh phrAsE.

	yEs	no
A、mAy BE CovErED By A light lAyEr oF Dirt．
B、is rElAtivEly uniForm in tErms oF its thiCknEss．
C、is oFtEn FounD BEnEAth An“ACtivE lAyEr”thAt thAws in thE summEr．
D、DoEs not Exist outsiDE oF mAjor AlpinE ArEAs in highEr lAtituDEs．
ｅ. tEnDs to BE pAtChy in ArEAs whErE thE tEmpErAturE stAys ArounD FrEEzing．