a sequence in which each term is calculated by multiplying the previous term by a common ratio,...

the scientific study of landforms and the processes that shape them

when the air moves parallel to the isobars at right angles to the pressure gradient because...

the present participle of a verb, used as a noun, e.g. I like running. Swimming is great.

(also called a hot spring) place where warm water shoots out of the crust in volcanic areas