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Oceans Unit - Science
Transcript of Oceans Unit - Science
The Four Main Oceans
Why Is the Ocean Salty?
What is the bottom
of the Ocean like?
Why does the Ocean
Rise and Fall?
What Causes Waves
What Are Waves Like?
Streams in the Ocean
A Trip to the Depths
Creatures of the Ocean
Treasures from the Ocean
1. Where is most of the world's water?
2. What are the four main oceans?
3. What is the intertidal zone like?
4. What is the world ocean?
5. How is the shallow ocean zone different from the open ocean zone?
1. Where does salt originally come from?
2. What are two ways that salt gets into the ocean?
3. Why aren't rivers salty?
1. What is the continental shelf?
2. What are two kinds of underwater mountians?
3. What are the deep valleys in the ocean floor called?
4. What is ooze?
1. What are tides?
2. What causes tides?
3. When does a spring tide happen? A neap tide?
1. How are waves important in creation?
2. What causes waves?
3. What is a tsunami?
4. How do waves move?
1. What is a current?
2. How are currents important in creation?
3. Why do you suppose the wind make surface currents rather than deep water currents?
4. How do water temperature and saltiness cause currents?
5. What currents might affect weather in your area?
1. What is the intertidal zone like?
2. What is the main problem at high tide? How do intertidal creatures deal with it?
3. What is the main problem at low tide? How do intertidal creatures deal with it?
1. What are the different levels of the ocean?
2. Which level has the most life?
3. Why can't plants grow very deep in the ocean?
4. How are deep-sea creatures designed for their habitat?
5. Why might a sea animal need to make its own light?
1. What foods come from the ocean?
2. What is kelp used for?
3. What is a nodule?
4. What resources from the ocean do you use?
How much of the earth do you think is covered by the ocean?
See Ocean Zone Diagram in Your book
Sail Around the World... Is it possible?
Let's get off topic
What ship struck an Iceberg and sunk in the Atlantic ocean?
Did you know that...
the Pacific Ocean is almost twice as big as the Atlantic Ocean?
all the land in the world could fit in the Pacific Ocean?
the Arctic Ocean is almost completely covered with ice?
the word Pacific means peaceful?
How does salt get into the ocean?
Ocean water is not quite as salty where rivers empty into the ocean. Why do you think this is?
Ooze: Fine mud on the ocean floor
Marina Trench = Super cold
Why doesn't it freeze?
Longest chain of mountains?
Where is the world's deepest valley?
All are on the ocean floor.
Are the slow rise and fall of ocean waters
Most areas have four tides a day
What causes tides?
Moon has the largest effect
High & Low Tides
Spring & Neap Tides
Where do waves come From?
Many waves are caused by wind.
A rushing wind will make much larger winds than a gentle breeze
Has anyone gone out to Lake Michigan and seen large waves? Why do you think the waves were big that day?
Sometimes wind blows against a wave so hard that it pushes water off the top = Whitecaps
Underwater earthquakes can also cause waves = Tsunamis
Many tsunamis are very small when out in the middle of the ocean - only about an inch high.
They travel through the water at speeds up to 600 mph.
When a tsunami gets close to land it slows down and the water begins to pile up - by the time the wave reaches shore it can reach heights of 100 feet
What causes Tsunamis?
A current is a stream of water moving through the ocean.
What is a current?
Move very quickly
others move slowly
move warm water
Others move cold water
travel deep under the ocean
others travel close to the surface
Currents can effect the weather on land
Where do currents come from?
Most Surface currents...
...are caused by the wind and the movement of the earth
Currents in the deep sea...
...are caused by...
different water temperature
One problem intertidal creatures have to face is waves.
How do they keep from getting washed away?
Barnacles and Limpets
They are firmly attached to rocks. The strongest wave cannot wash them away.
They feed on algae and plankton when the tide comes in.
Seaweeds have rootlike structures called holdfasts that attached to rocks and keep them from being pulled from their rocks
Crabs and Clams
Hide between rocks or burrow deep into the sand.
They trap tiny bits of food that the tide brings in.
Another issue is how these creatures stay moist when they are out of the water for up to 6 hours at a time.
Barnacles, Limpets, and Mussels
Can keep water in their shells
Can dry out almost completely and revive again when the tide comes in.
Hide under wet algae to stay damp
Water here is warmed by the sun.
More plants and animals live here than anywhere else
Plenty of light
They are the main food source for all the other ocean creatures
Depends on the current to bring it food
Coral Reef Animals
Surface water still light
Water not as warm
Open Ocean Animals
Dark & Cold
No Light Here = No Plants
The Ocean is...
A treasure chest filled with food, minerals, and energy sources
Fish Oil and Fish Meal
Pet foods, plant foods, and medicines
Kelp - good source of agar and carrageenin
These are used to thicken ice cream, toothpaste, yogurt, and salad dressings.
Caring for the ocean
Bill Nye - Currents
Bill Nye Song
The oceans are a natural resource
Where have you heard this term before
Social Studies - Human Geography