info@bestmytest.com Looking for IELTS info?

permafrost

Find out how TOEFL Tutor can help you improve your score with a 7 day free trial

definition: 
A thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in polar regions.
sentence: 
The permafrost below the topsoil is frozen all year around, and this prevents roots from penetrating deeply into the ground.
difficulty: 
medium
toefl frequency: 
2
toefl classification: