This is what makes an ignimbrite; the general term for this kind of volcaniclastic rock is ‘tuff’.

It is but a step.

In an essay entitled 'Selfish Genes and Social Darwinism' (1983, p.366) she argues that 'sociobiological thinking, especially in its Dawkinsian form, actually reinforces Social Darwinism, both by its language and by some of its substance'.

It was once thought that the first humans in the Balearics had domesticated the mouse-goat, as what appeared to be pens filled with dung were found in some caves.