Answer to Question 1ANS: D
The geologists use sound waves because it reflects off these structures in particular signatures. These
distinctive signatures give them an idea where to drill. This is very useful because the cost of drilling
in the ocean is quite expensive. Information can be found in the section Physical Resources.
Answer to Question 2ANS: B
Some of the ocean's extracted salt is used for snow and ice removal. It is also used in food processing
and agriculture. Information can be found in the section Physical Resources