List of top Atmospheric Science Questions on Oceanography

Which one of the following is artificial pollutant ?
Let $x_1, x_2, \ldots, x_{n_1}$ and $y_1, y_2, \ldots, y_{n_2}$ are two independent random samples from normal population with same variance. To test the hypothesis, the t-test is given by : [Here $\mu_1$ and $\mu_2$ are means of two samples].
Arrange the following according to the depth of occurrence starting from deep to shallow.
A. Continental slope
B. Continental shelf
C. Abyssal plains
D. Continental rise
Arrange the following significant salts in decreasing order of their percentage in the oceans:
A. MgCl\(_2\)
B. CaSO\(_4\) (assuming typo for CuSO\(_4\))
C. MgSO\(_4\)
D. NaCl