Help please please please

D. Pollution

Explanation:

I believe the best answer choice is D. Rising ocean temperatures do cause a rise in ocean levels, coral bleaching, and ocean deoxygenation. However, I don't think rising ocean temps directly led to increased pollution, as pollution nowadays are mainly caused by humans

50.23 i believe is correct but don't quote me on that.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.