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Ocean Layers Worksheet

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Ocean Layers Worksheet

Use the ocean profile and the information in each question to investigate how conditions change with depth. Ocean-zone boundaries are approximate and can vary between sources.

Read the ocean profile

The upper zone (0–200 metres) receives enough sunlight for tiny plant-like plankton to photosynthesise. In the dim-light zone (200–1,000 metres), only faint light reaches. Below it, the dark zone (1,000–4,000 metres), Abyss (4,000–6,000 metres) and Trenches (deeper than 6,000 metres) receive no sunlight. Water generally gets colder and pressure increases with depth. Ocean zones are named by depth and light, not by the animals that happen to be there.

1.Which ocean zone receives the most sunlight?
  • Sunlight zone
  • Twilight zone
  • Midnight zone
  • Abyss
2.Write the five ocean-zone names in order from the ocean surface to the deepest parts.
3.A remotely operated vehicle is at 750 metres deep. Use the approximate depth ranges in the ocean profile to name its zone.
4.The Midnight zone receives no sunlight.
TrueFalse
5.As you travel from the uppermost ocean zone down towards the Trenches, water generally becomes and water pressure .
6.Match each ocean zone to the best description.
  • Uppermost zone
  • Dim-light zone
  • Dark zone
  • Trenches
  • Faint light reaches this zone
  • The deepest ocean areas
  • Enough sunlight for photosynthesis
  • No sunlight; below the dim-light zone
7.A dumbo octopus lives in deep water where there is no sunlight. Explain why it cannot rely on sunlight to make its own food, and give one way it might find food instead.
8.Why might photosynthesis happen in the uppermost ocean zone but not in the deepest dark zone?

Ocean connections and care

Aotearoa New Zealand is surrounded by ocean. Seas connect people, wildlife and places, while human activities can affect marine habitats.

9.Name one way the ocean is important to people in Aotearoa New Zealand, and explain your choice.
10.Choose one action people in Aotearoa New Zealand could take to reduce harm to marine life. Explain how it could help animals living in the ocean.

2 printable pages

  • Ocean Layers Worksheet, page 1 of 2: Read the ocean profile

    Page 1

  • Ocean Layers Worksheet, page 2 of 2: Ocean connections and care

    Page 2

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