An exudate is a fluid emitted by an organism through pores or a wound, a process known as exuding. Exudate is derived from exude, to ooze, from the Latin exsÅ«dÄre, to (ooze) out like sweat (ex- out and sÅ«dÄre to sweat).
Glacial striations on bedrock. Rocks embedded in the bottom of a massive glacier scratched the rock underneath as the glacier moved along. Even though there is no ice present today, these scratched lines are evidence that glaciers were here in the geologic past.lacial striations are parallel to the handle of the hammer. Look at how the lines all go the same direction. Click to Enlarge. About : The scratch marks on the schoolyard are formed by the process shown on top -- a broom dragged along over wet tar.
Striations are usually multiple, straight parallel lines which represent the movement of the sediment loaded base of the glacier over. Striae can range from microscopic size on a seemingly polished rock to obvious markings millimeters deep and nearly a meter in length.n glaciated regions the rock surfaces will show signs of ice movement over them providing that the surface has not been eroded in the time since glaciation. Signs of movement could be channels, grooves or striations depending on the size of the sediment contained in the glacier.