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].