Question

In northeastern Minnesota, the glaciers were thousands of feet thick and glacial scratches and striations show that the ice moved from north-to-south through the state. Ice alone is not very abrasive. Formulate a theory for the cause these striations in the volcanic basalt of the Minnesota bedrock.

Answer 1

Here's what I get

Step-by-step explanation:

As the glaciers moved southward, they picked up large amounts of rock.

The rocks carried along by the glacier dug striations (gouges) in the bedrock beneath.

The image below shows an example of glacial grooves,