Here's a breakdown:
* Glacial drift is a general term encompassing all the materials transported and deposited by glaciers.
* Till is a specific type of glacial drift that consists of unsorted, unstratified sediment directly deposited by a glacier.
* Outwash is another type of glacial drift, but it refers to the sediment that has been sorted and stratified by meltwater streams flowing from the glacier.
So, while till and outwash are both types of glacial deposits, the umbrella term that encompasses them all is glacial drift.
