How much of our total land mass do national parks in Canada occupy? 

A)  25% 
B)  5% 
C)  3% 
D)  1%

The main cause of melting along subduction zones is the:

A) rise and decompression melting of mantle lithosphere
B) rise and decompression melting of mantle asthenosphere
C) melting of the subducting plate
D) release of water from the subducting plate