1. It was good to feel the firm ground underfoot after hours of trudging through flooded fields.

2. 23 It was good to feel the firm ground underfoot after hours of trudging through flooded fields.

3. There had been such a wide expanse of firm ground that a trench had never been worn.

4. It's good to feel the firm ground underfoot after hours of trudging through flooded fields and over hedgerows in the darkness.

5. The applicability of the expressions for elastic and inelastic response spectra that are employed in seismic design codes is tested by using an ensemble of 21 earthquake accelerograms, all recorded on firm ground along the west coast of North America.