EXERCISE 1.4 Sources of Heat for Earth Processes Name Course EXERCISE 2.2 Sectio

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EXERCISE 1.4 Sources of Heat for Earth Processes Name Course EXERCISE 2.2 Section Date: Some of the heat that affects geologic processes comes from the Sun and some comes from inside the Earth What does each of these heat sources play in Earth processes? Courve (a) If you take off your shoes on a beach or any sandy environment and walk on it on a hot, sunny day is the sand hot or cold? Why? Trac bec Now, dig down in the sand just a few inches. What do you feel now, and why? What does this sugsest about the depth to which heat from the Sun can penetrate the Eartha (4) Base th Based on this condlusion is the Sun's energy or Earth's intemal heat the cause of melting rock within the Earth? Explain (b) The deeper down one goes into mines or drill holes, the hotter it gets. This temperature increase is geothermal gradient. Does this phenomenon support or contradict your conclusion in (a)? Explain In the upper 10 km of the crust,the geothermal gradient is typically about 25"C per km, but it can range from 15°C/km to So"clm. In the ce thre geothermal gadents (S'CAm 2s'Ckm, and S0"CAm) for the 10 450 500 100 150 200 250 300 30400 Temperature (C) 0 0 The deepest mine on Earth penetrates to a range of temperatures would you expect in the mine? Explain your answer. How hot is it in the bottom of this What assumptions did you make to come up with this answer? The depest mine on Earth penetrates to a depth of about 2 km. Using the geothermal gradients you just drew,what mine?

Explanation / Answer

(a) It will be very hot if we keep out our shoes on a sandy beach as the sands heats very fast. This is because sand have low specific heat capacity and thus it will heat quickly.

If we dig down we’ll see that it’s cold out in there as almost all of the incoming heat from the sun is used in heating the sand and we don’t have any heat left to raise the temperature of the lower surface.

This suggests that the sun’s heat don’t penetrate very much and won’t even penetrate to some inches as seen in the answer above.

Melting of the rocks inside the surface requires enormous amount of heat and this cannot be supplied by sun’s energy as we have seen that it won’t penetrate that much and hence the rocks inside the surface of the earth melts because of the internal heat of the earth.

As per Chegg’s policy we are adviced to attempt only the 4 parts of the questioner, please post the remaining questions as other questioner. Thanks

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