In my years of teaching Earth Science, I have discovered that one concept seems to tie more physical phenomena together than any other. Frequently it is the cause of what is observed and often it is the connecting thread between interactions of matter and energy. So I thought to give a few examples of why it is so often the correct answer to questions in Earth Science:
Earth Science is all about density
What will go up and what will come down
That convective cell propensity
Uneven heating of the atmosphere
Solar gain and wind and pressure change
Forced aloft forms clouds, sinking air clear
Heat, salt, and wind stir up the oceans
Many upwellings from the great deep
Gyres and thermohalocline motions
Far below the roots of the mountains
Plates form rifts, volcanoes, and trenches
Float on plastic and magma fountains
In the stars war gravity and fusion
Caldera of rarified plasma
Spots and flares in boiling confusion
Thus mass divided by volume seen
In many small and grandiose ways
And from its study much knowledge glean
CreatorWorship 