Here's a breakdown:

* Till: This is unsorted and unstratified material directly deposited by a glacier. It can contain a wide range of particle sizes, from clay to boulders, all mixed together.

* Glacial Erratics: Large boulders that have been transported by glaciers from far away locations. These are often a different rock type than the bedrock in the area where they are deposited.

Glacial till can form various landforms, including:

* Moraines: Ridges of till that form at the edges or ends of glaciers.

* Drumlins: Elongated hills of till that are often aligned in the direction of ice flow.

* Kettles: Depressions in the landscape formed by melting blocks of ice that were buried in the till.

Let me know if you'd like more information about any of these terms or aspects of glacial deposits.