The heat energy stored in the uppermost 10km of the Earth’s crust is equivalent to how many times the total energy stored in all the world’s oil and gas?
A. 50,000
B. 500
C. 5
D. 0.5
Submit your answer in the comments below for your chance to win a prize worth £25!
The entry period is from 3rd March 2014 to 3rdApril 2014.
All entries must be received by midnight on 3rd April 2014.
If you haven’t done so already, please register for our newsletter by clicking here
Click here for terms & conditions.