Earthquakes are vibrations of Earth's crust. Which of the following is used to
measure the size of an earthquake?
a. barometer
b. Doppler radar
C. depth scale
d. Seismograph

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.

the answer is d. matter from the air combined with the steel wool.