What marine resource has been rendered uneconomical due to the ...

[olgavictoria]

What marine resource has been rendered uneconomical due to the cost of excavation?
  a. Magnesium compounds
  b. Manganese nodules
  c. Sand and gravel
  d. Salt

Question 2

Why does oil seep to the surface from its source rock?
  a. Capillary actions
  b. Convection
  c. Oil is less dense than surrounding sediments
  d. Porosity is higher at the surface

[pami445]

Answer to Question 1

ANS: B
There are different ways of mining manganese nodules. Unfortunately, none of the methods people
have come up with have made it cost effective to mine these nodules. There may come a point in time
when the mining of these nodules becomes economical. Information can be found in the section
Physical Resources.

Answer to Question 2

ANS: C
Oil migrates to the surface through porous overlaying formations. It does this because it has a lower
density than the sediments around it. Information can be found in the section Physical Resources.

[olgavictoria]

TY

[pami445]

You're welcome