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Squinted and peered. This tells me that it might have been hard to see anything, especially in the fog.

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Shivering - The Captain was cold even though he had lots of layers of clothes on, this shows how cold it was. He also might be shivering as he might feel scared.

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Perpetual darnkess - this means that it was constantly dark.

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Darnkess. This tells me that the sky was black.

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Billows of snow makes the reader imagine a huge wave of snow covering the boat.

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Gust of fog creates that image that it hit them like strong wind

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Misty tells us that the Captain can't see anything

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Misty is like fog but not as thick

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Blizzard means massive snow storm

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He could see a black shape moving swiftly against the white plains of ice

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Reluctantly.
This means unwilling or not keen

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Captain Walton polar explorer peers through the  steam of his breath

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Fog sweep across swiftley ely across his gaze men's the fog is swifley souronding him

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Misty and darkness makes it seem scary like something bad might happen.