Ocean Layers
This is the surface layer that extends 0 to 200 meters. It supports 90% of all marine creatures.
The Sunlight Zone
TRUE OR FALSE: The ocean floor has a lot of the same landforms and geographical features that we see everyday.
TRUE
TRUE OR FALSE: Cnidarians are marine invertebrates. They have no backbone.
TRUE
TRUE OR FALSE: Sea cucumbers are real cucumbers that grow on vines.
FALSE
How many oceans are there?
Five - Arctic, Atlantic, Pacific, Indian, and Southern
No sunlight reaches this zone. It is completely dark all the time.
The Hadal Zone / The trenches
This part of the ocean floor is extremely smooth and mostly flat. It goes on and on for miles and is probably the smoothest surface on the entire planet!
The abyssal plain
Name two cnidarians.
Jellyfish, sea anemones, coral, hydras
Name two echnioderms.
Sand dollar, sea cucumber, starfish, sea urchin, sea Lillies
The ________ Ocean is the largest ocean, covering about 30% of planet Earth.
Pacific
This layer does not receive any light at all. Many ocean animals here create their own light in a process called bioluminesence. About 10% of marine life lives in this zone.
A) Midnight Zone
B) Twilight Zone
C) The Abyss
D) Sunlight Zone
A) Midnight Zone
Miranda is at the beach building a sandcastle with her little brother, Will! They walk into the ocean to rinse the sand off of their hands. This is the edge of our continent that is shallow and gently sloping. What part of the ocean floor are Miranda and Will standing on?
The continental shelf
Cnidarians use their ______ to try and catch prey.
A) Arms
B) Polyps
C) Tentacles
D) Brains
C) Tentacles
Echinoderms are known for their _______ skin.
spiny
Look at the printed map. Which ocean is marked with the letter B?
Pacific, Southern, Indian, Atlantic, Arctic
Atlantic Ocean
This is the ocean layer that extends from 200 m to 1,000 m deep. It has dim light. The sunlight fades as you go deeper. Squid, jellyfish, lantern fish, and many more live in this layer.
A) Midnight Zone
B) Twilight Zone
C) The Abyss
D) Sunlight Zone
B) Twilight Zone
An underwater volcano is called a __________.
seamount
Cnidarians have tentacles that are lined with stinging cells that release a venom into their prey. What are these stinging cells called?
A) Intestines
B) Nematocysts
C) Spines
D) Tubes
B) Nematocysts
Tube feet help an echinoderm ________. Tube feet also help them stick to the ocean floor or to the side of an aquarium tank.
Move
Look at the printed map. Which ocean is marked with the letter C?
Pacific, Southern, Indian, Atlantic, Arctic
Indian
What is the deepest known part of the world's oceans?
Marianas Trench
Underwater mountain ranges are called _________.
Mid-ocean ridges
Cnidarians have radial _______ , meaning that their bodies are arranged around a central axis. Their bodies can be divided into multiple pieces that all look exactly the same.
symmetry
Write two sentences or more explaining why sea cucumbers are a vital part of the coral reef ecosystem.
~ answers will vary: they clean/filter the sand for the other ocean organisms; they are natural cleaners; the clean up the ocean floor; act like a vacuum cleaner and eat decaying/dying animals; keep diseases away from the coral reef
This is the smallest and shallowest ocean.
Arctic!