The ocean is divided into different layers. The zones differ in temperature, water pressure and available nutrients. Marine organisms live in different zones according to the amount of sunlight that reaches there.
Sunlight Zone: More than 90% of marine life lives in the Sunlight Zone.
Twilight Zone: Animals that live in the twilight zone must be able to survive cold temperatures, an increase in water pressure and dark waters. There are no plants in this zone, because there is not enough light for photosynthesis. Some animals that live in this zone make their own light with bioluminescence.
Midnight Zone: No sunlight reaches this zone. It is very cold and the water pressure is high. Animals in this zone tend to be translucent or white. Many of the creatures these creatures survive by eating organic material which drifts down through the depths. Others actually feed off the earth itself, consuming bacteria produced from the methane and sulfides seeping through the ocean floor.
Trench Zone: These are the deepest trenches in the ocean. This zone is found from 6,000 meters (20,000 feet) to the bottom of the ocean. Most life is sustained by marine snow or chemical reactions around hydrothermal vents.
Animals of the different Ocean Zone Layers:
- Sunlight Zone – Blue Marlin, Sperm Whale, Grey Reef Shark, Plankton, plankton, sea stars, jellyfish, sea urchins, sea turtles, dolphins, seals, sharks, sting rays, sand dollars, fish
- Twilight Zone – Octopus, Squid, Deep diving whales, Hatchetfish, Viperfish, Cuttlefish, deep diving whales
- Midnight Zone – Angler Fish, Snipe Eel, Lizard Fish, Sea Cucumber, Lanternfish, Sea Cucumber
- Trench Zone – mussels, crabs, tube worms, viperfish
This is a glimpse of the new Ocean Zone Layers Activity Cards:
Layers of the Ocean Activity Packet: There are two Ocean Zone Activities. It includes the ocean animal sorting cards and zone cards. And it also includes an Ocean Depths activity, which covers things like — how deep was the deepest scuba dive, the Titanic wreckage, the deepest recorded fish, or how far down is the Mariana Trench, etc. Students can cut out pictures of these and place them at the appropriate depth. (Also in the packet, you’ll find this same activity in meters.)
The Ocean Zones Activity Packet is now available for $3.00.
Once you pay for this packet, you will immediately receive a link to download this file (which will open in a browser window). You will also receive an email from Sendowl (the service I use), which will have a link you can click on to download the Layers of the Ocean Activities pdf. (It will say, “You can download your digital products…” with a clickable link.) Of course, if you have any issues just email me at — liesl at homeschoolden dot com. You can also reach me by using the contact form on the blog or can reach me over at our Homeschool Den Facebook Page. ~Liesl
Update: We have been studying the Ocean again in the spring of 2016. Our 65+ page Ocean Unit (see details about our 65-page ocean curriculum here) is now available.
- Ocean Unit: Marine Habitats, water form words (bay, strait, fjord, etc.), tides and currents, salinity, features of the ocean floor, Ocean Life:
- Special Body Features
- Fish Body Shape and Movement
- Biological Interactions: Mutualism and Commensalism in the Ocean
- Deep Sea Life – Bioluminescence, Anglerfish
- You might also be interested in these free notebook pages about Earth’s 4 major systems (or ecospheres): atmosphere, geosphere, hydrosphere, biosphere. We are reviewing these before diving into our Ocean Unit (hydrosphere)
You may be interested in these related posts:
- Earth’s atmosphere (free packet)
- weather unit (free packet)
- Animal Unit: Animal Characteristics, the 5 animal groups, invertebrates, spiders vs. insects, domestic vs. wild animals, animal tracks