Copy two sentences from "the slip-over sweater" in which grace is compared to something in nature.

"And I knew she had the durability and the toughness of a storm-battered mountain oak." In this paragraph, the narrator is describing his admiration for Grace and her resolve as she walks a long way to school every morning and every evening, even when the weather is particularly bad. This is why she is compared to a "storm-battered ... oak." "Grace was as beautiful as our mountain was in April, prettier than a blossom of wild phlox or a mountain daisy." This is towards the end of the story when the narrator truly realises Grace's good looks. He uses comparisons with the pretty elements of his native land (the mountain and the flowers) to convey her beauty.

Alloy of metals is the answer