Submitted by admin on Thu, 04/17/2014 - 19:50
definition:
The outermost layer of rock of which a planet consists, especially the part of the earth above the mantle
sentence:
Magmas erupted in continental volcanic arcs typically contain components from many sources in the crust, lithospheric mantle and asthenosphere
difficulty:
medium
toefl frequency:
2
toefl classification: