Multi-year ice is the hardest sea ice and...

Question 1 / 2066636ee728f7522a1c518343

Question 1 of 2066636ee728f7522a1c518343

Multi-year ice is the hardest sea ice and should be avoided if possible. It is recognizable because of what tone to its surface color?

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Question 1 of 20

66636ee728f7522a1c518343

Multi-year ice is the hardest sea ice and should be avoided if possible. It is recognizable because of what tone to its surface color?

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🔍 Key Concepts

• Differences between first-year ice and multi-year ice • How age of sea ice affects salinity and therefore color • Visual characteristics: surface tone, roughness, and melt ponds on older ice

💭 Think About

• Think about what happens to the salt content in sea ice after it survives more than one melt season—how does that change its appearance? • Recall which ice types tend to look darker vs. lighter and which look more opaque vs. clearer. • Consider which color tone would match very hard, dense, old ice that has had brine drained out over time.

✅ Before You Answer

• Be clear on the visual difference between new/grey/grey-white ice and older, thicker ice. • Ask yourself which color is often associated with very pure, dense ice rather than ice still containing a lot of brine and air. • Eliminate any options that you associate more with thin, young, or dirty ice rather than multi-year ice.

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Question 1 of 20

Multi-year ice is the hardest sea ice and should be avoided if possible. It is recognizable because of what tone to its surface color?

Grey-white

Bluish

Greenish

Grey

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