Submitted by admin on Mon, 04/21/2014 - 19:54
definition:
Relating to or produced by the internal heat of the earth
sentence:
Some 70 per cent of Iceland’s energy needs are met from geothermal sources.
These rocks were later affected by low-grade metamorphism under high geothermal gradients
difficulty:
medium
toefl frequency:
2
toefl classification: