EARTH: An Ocean Planet Ms. McGee and Ms. Graham - PowerPoint Presentation

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EARTH: An Ocean Planet

Ms. McGee and Ms. Graham

6

th

grade Earth and SpaceSlide2
Slide3

Bell-ringer: (7 minutes)

Directions: Write and answer each question in COMPLETE sentences in your science notebook.

List Earth’s 5 oceans.

What do you think the ocean floor looks like?

How deep is the deepest part of the ocean?Slide4

Earth: An Ocean Planet

What we think of as the ocean is actually 5

different oceans:

the Pacific, Atlantic, Indian, Arctic, and Southern.

But they make up one big body of water.

Today, the ocean covers nearly three-quarters of the Earth. Slide5

What are the names of the different zones of the ocean?Slide6

The Epipelagic Zone

Epipelagic Zone- The “sunlight zone: of the ocean, ranging from the surface to a depth of 200 meters.

(about 500

ft

)

Facts:

This is the

brightest

and

warmest

of the zones.Plants and algae (AL-jee) can grow here, and it is home to a huge variety of animals. It's the shallowest of the zones, but is more crowded with creatures than the other zones.Slide7

The Mesopelagic Zone

The

ocean’s

twilight zone

which extends 200 to 1000 meters

(500 to 3,000

ft

) below the surface.

Dimmer and colder

as the water gets deeper.

Plants

and algae can't survive here, and the animals in this zone are specially adapted to living in darkness. Many have big eyes to help them see. And some are bioluminescent (BY-oh-loo-min-ES-ent

), which means they can make light with their bodies. They may use the light to attract prey or send signals to mates.Slide8

The Bathypelagic Zone

The ocean’s

“midnight zone”,

extending from 1000 to 4000 meters (3-25k

ft

)below the surface.

Brrrr

, you wouldn't want to visit the midnight zone.

T

emperatures are close to freezingThe water is pitch-black Food is scarce Fewer

animals live

here

90 % of

the water in the ocean is in this zone.Slide9

The Abyssopelagic Zone

The region of the ocean from 4000 to 6000 meters

(15-20k

ft

) below the surface.

Its name derives from the Greek belief that the ocean had no bottom.Temperature ranges from 10

° to 4°C (50° to 39°F). Slide10

The Hadal Zone

Also

referred to as “the trenches”

The

DEEPEST parts of the ocean

,

including everything below 6000 meters. (20k feet)This zone does not spread across the ocean floor but exists only in the deepest ocean trenches.

Because

no light reaches this part of the ocean

, it is

impossible for plants to thrive but there are still hardy creatures that call these depths home.Slide11
Slide12

The Continental shelf

Extends out about 80 km (50 miles) from shore with depths about 200 meters.Slide13

The Continental Slope

The continental slope is a STEEP drop which connects the continental shelf to the ocean floor.Slide14

The Continental Rise

The buildup of sediment before the vast deep sea-floor is called the continental rise.Slide15

The Abyssal Plain

At the end of the continental rise is the abyssal plain, or the deep-sea floor.

Found between 3000 and 6000 meters.

Abyssal plains cover more than 50% of the Earth’s surface.Slide16

Trenches

Trenches are v-shaped valleys and are the deepest points on Earth.

They go as deep as 8,000-1000 meters. (5-6 miles)Slide17

Guyot

A 

guyot

 /

ɡi

ːˈ

joʊ/, also known as a tablemount, is an isolated underwater volcanic mountain (seamount), with a flat top over 200 metres

(660 feet) below the surface of the sea. The diameters of these flat summits can exceed 10 km (6.2 mi).Slide18

Sea Rift

A

Sea Rift

 is a spreading center between two tectonic

plates. Slide19

Shoreline

the line along which a large body of water meets the

land

.