slowly moving mass or river of ice formed by accumulation and compaction of snow on mountains or near poles. Very large river of ice moving down a mountain.

find unexpectedly or while searching.

something that is kept or meant to be kept unknown or unseen by others. Information that others do not know.

action of one object striking another. Acts or forces of one thing hitting something else. come into forcible contact with another object.

From million to million years ago. era between Palaeozoic and Cenozoic eras.

matter that settles to bottom of liquid. Material that settles to the bottom of a liquid. settle as sediment.

arrangement of and relations between parts or elements of something complex. construct or arrange according to plan.

Occurring in a slow manner over a period of time.

small part broken off or separated from something. Parts that are broken off of some things. (Of computer file) to be broken into pieces.

land along coast.

relating to natural world and impact of human activity on its condition.

To hold something inside something else.

having fallen or been allowed to fall vertically. To drive someone to a place and then drive away.

act of reaching out with one's arm. To extend a hand or arm to touch or take something.

person who is studying or has expert knowledge of one or more of natural or physical sciences. People who are trained in a science.