sound; just; well-founded

something written

doing things to achieve a specific goal

a book that is used to study

to think of, or create, something new (e.g. idea, child)

a plant or animal that has become rock after many thousands of years

a long, thin part of something which is a different color from the parts beside it

to turn something upside down

the smallest unit or amount of energy

the time of year to bring crops in from the fields