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.
Erratics are significant because: 1  Since they are transported by glaciers, they are one of a series of indicators which mark the path of prehistoric glacier movement. 2  Their lithographic origin can be traced to the parent bedrock, allowing for confirmation of the ice flow route. 3  They can be transported by ice-rafting.herefore, a correlation between the iceberg size and the boulder size can be established. For example, 1.5-metre (4.9 ft) diameter boulder can be carried by a 3-metre (9.8 ft) high iceberg and could be found stranded at higher elevations than a 2-metre (6.6 ft) boulder which requires a 4-metre (13 ft) high iceberg.