What definition BEST describes a watershed? Select one:

A: Consists only of rivers, lakes, and streams

B: Area that collects precipitation and drains it to the lowest point

C: All of the rain water of a specific area

D: Place where all water is stored underground

I would say go with B not so sure but pretty sure it is

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.