A taste of what's inside each topic — more tricks, forums & chatrooms in each section.
Minerals · Mohs Scale
Mohs Hardness 1–10
"The Girls Can Flirt And Other Queer Things Can Do"
Talc · Gypsum · Calcite · Fluorite · Apatite · Orthoclase · Quartz · Topaz · Corundum · Diamond
Rock Types
The Rock Cycle Order
"Igneous Sam Met Really Slowly"
Igneous → Sedimentary → Metamorphic → back again. Reminds you heat/pressure transforms one into another in a continuous cycle.
Geologic Time · Eras
Geologic Eras (oldest → newest)
"Pigs Might Possibly Cause Quite Nervous People"
Precambrian · Paleozoic · Mesozoic · Cenozoic — or use the first four for just the Phanerozoic eons. Visualize a timeline of life exploding from simple to complex.
Plate Tectonics
Three Boundary Types
"Convergent = Crash, Divergent = Drift, Transform = Twist"
The first letter matches the action: Crash together, Drift apart, Twist sideways. Picture the San Andreas (twist), the Mid-Atlantic Ridge (drift), and the Himalayas (crash).
Earth's Structure
Layers Inside Out
"Crunchy Mantle, Outer Core, Inner Core" → "Crispy M&Ms Often Impress"
Crust · Mantle · Outer core · Inner core. Remember: the inner core is solid iron even though it's hottest — extreme pressure keeps it solid.
Stratigraphy
Law of Superposition
"Younger stuff sits on top — like laundry piled on your floor."
The bottom layers are oldest; the top layers are youngest — unless the strata have been overturned by tectonic forces. Always check for unconformities (gaps in the record).