When is light flashes into your eyes the pupils gets smaller .which term describes this actions?

When it's dark, the iris widens and the pupil dilates, or gets bigger, to allow as much light as possible to enter the eye. The opposite occurs during the day. When the Sun is shining bright, the iris narrows and the pupil constricts, or gets smaller.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.