UNIT ABBREVIATIONS AND CONVERSIONS:
- mm = millimeter: 1 mm = 0.039 inches (slightly less than the thickness of a dime, and 25.4 mm = 1 inch)
- cm = centimeter: 1 cm = 10 mm = 0.39 inch
- m = meter: 1 m = 1.09 yards = 3.28 feet = 39.37 inches
- km = kilometer: 1 km = 1,000 m = 0.62 mile
- km2 = square kilometer: 1 km2 = 100 hectares = 247 acres (100 km2 = 38.6 mi2)
- km3 = cubic kilometer: 1 km3 = 0.24 mi3
- Ma = Million years ago: 1 Ma = 106 years = 1 mega annum)
- mm/yr = km/million years (a useful conversion when viewing plate motion velocities on main map)
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