composition of, [20];
oblateness of, [10];
rigidity of, [20], [21], [29];
scale of its elevations, [10], [11];
theories of origin of, [20], [29];
surface shell, chemical constitution of, [23];
surface shell, response to load, [340].
Earth features, shaped by running water, [169].
Earth figure, evolution of ideas concerning, [9].
Earthquake cracks, [74].