"The Rock Cycle" is a song about two interrelated subjects. First, it is about the theory of "plate tectonics". This theory explains that Earth's crust
is made up of many plates, which float on the molten rock beneath them. There are cracks, or faults, where these plates meet and here earthquakes and volcanoes often appear when the plates move.
      The second related topic in this song is, of course, where it gets its name. The lyrics explain how rocks are formed, and identify the three different types of rocks (igneous, sedimentary, and metamorphic) and differences in how each type is formed. Voilá - the Rock Cycle!!

Now Plate Tectonics is the theory
That crust is movin' under me
Continents they drift apart
'Cause molten rock is in Earth's heart
Scientists say there are three ways
That plates can move around these days
Convergent, Divergent, and Transform-Fault
Is what this rumbling's all about
Chorus:
Let it rock! the rock cycle
Let it rock! the rock cycle
The rock cycle, the rock cycle, let it rock!
Two hundred million years ago
Pangaea was the land below
Continents they drift apart
Heat and pressure is the start
Check the seismograph it shakes!
Plates are moving - EARTHQUAKES!
Rumble underground below
Better run, she's gonna BLOW!
Chorus
Now magma pushes through the crust
And when it cools it's Igneous
The next in line is elementary
Weathering makes it Sedimentary
Then heat and pressure make rocks change
The stuff inside can rearrange
The final rock, you can't ignore it,
Yeah, you know, it's Metamorphic!
Chorus