(petrology) green tuff

a seed / a pit or stone in a fruit / a gamete (reproductive cell such as a spermatozoan or egg) / a lineage, bloodline / an origin, cause / the materials or ingredients from which something is made

(geology) volcanic ash

rock (natural mineral aggregate)

(calculus) Green's theorem

tough

formation / Short for 形成手術.

form, take form

green / putting green / being green, environmentally friendly

Greene / Green