While there are several differences between the two, the key difference between limestone and gravel is their compositions. Limestone, made from calcium carbonate, takes millions of years to form.

Typically, I can find humor in everything. Just ask my co-workers, friends and family — come to think of it please don’t ask ...

The relative importance of these land uses will vary depending ... and supply will be more important in a glaciated area such as the Lake District, than in a limestone area such as the Yorkshire ...