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2. If Earth's plates are constantly moving, why don't we need to update the locations of continents on world maps
(such as the one above) all the time?

b) nuclear ive learned that in a pedtrodic table

i believe the answer is three water molecules

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.