About how fast are Earth's tectonic plates moving, on average?
A.0.2-0.5 cm/yr
B.2-10 cm/yr
C.50-100 cm/yr
D.10-20 m/yr
A.0.2-0.5 cm/yr
B.2-10 cm/yr
C.50-100 cm/yr
D.10-20 m/yr