What is the explanation for a striated bedrock outcrop in a glaciated area, with two distinct sets

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What is the explanation for a striated bedrock outcrop in a glaciated area, with two distinct sets of striations, one set oriented north-south and the other oriented east-west?
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Conceptual Physical Science

ISBN: 978-0134060491

6th edition

Authors: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt

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