The Blue Planet - PowerPoint PPT Presentation

Loading...

PPT – The Blue Planet PowerPoint presentation | free to download - id: 609641-YTZjY



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

The Blue Planet

Description:

The Blue Planet Oceans 71% of the Earth s surface is covered by oceans. The ocean s contain 97% of the Earth s water. Less than 1% of the water on Earth is ... – PowerPoint PPT presentation

Number of Views:1057
Avg rating:3.0/5.0
Slides: 25
Provided by: WestMorri5
Category:
Tags: blue | ocean | planet

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: The Blue Planet


1

Earth
  • The Blue Planet

2
Oceans
  • 71 of the Earths surface is covered by oceans.
  • The oceans contain 97 of the Earths water.
  • Less than 1 of the water on Earth is fresh water.

3
Exploring the Oceans
  • Since ancient times, people have used the oceans
    for food, travel, and adventure.
  • The ancient Egyptians were the first to build
    seafaring ships, around 4000 B.C.

4
Exploring the Oceans
  • Early Polynesians and Phoenicians were
    accomplished fisherman and sailors who discovered
    new lands and sea routes for commerce.

5
Exploring the Oceans
  • Between the 9th and 12th centuries, Viking
    seafarers discovered Iceland, Greenland, and
    parts of North America.
  • In 1492, Columbus rediscovered America and helped
    launch the great European age of exploration.

6
HMS Challenger
  • This ship left England December 21, 1872.
  • And sailed around the world in 3 years.
  • Explored ocean currents, water temperature and
    chemical composition, and marine life.

7

The Big 5
  • Pacific Ocean
  • Atlantic Ocean
  • Indian Ocean
  • Antarctic Ocean
  • Arctic Ocean

8
(No Transcript)
9

Did You Know That?
  • The total salt content of seawater averages 3.5

10
Phytoplankton
  • Microscopic plants that live in the ocean.
  • Phytoplankton are the basis of the marine food
    chain.
  • Responsible for nearly half of Earths
    photosynthesis.
  • A soda can of seawater can contain 100 million
    phytoplankton.

11
Why is the ocean blue?
  • The ocean looks blue because seawater absorbs all
    the colors of the light sprectrum
  • except blue.
  • Blue light is reflected back off of the water
    and
  • The ocean appears blue.
  • The Red Sea is red because of red algae.

12
What would life be like without the oceans?
  • Without oceans, the temperature would fluctuate
    dramatically, making our planet inhospitable to
    life.
  • The ocean water is always on the move. Waves,
    tides, and currents influence climate and living
    conditions, both in the water and on land.
  • Ocean currents regulate temperatures around the
    globe.

13
Waves
  • Caused by wind.
  • Do not move horizontally.
  • They only move up and down.
  • Tsunamis (a.k.a. tidal waves) are caused by
    earthquakes, volcanic eruptions, or landslides.

14
Tides
  • Tides are periodic rises and falls of large
    bodies of water.
  • The are caused by the Sun and the Moon.
  • The Moon is the biggest factor.
  • Because the Earth is rotating...
  • 2 tides occur each day.

15
Resources from the ocean
  • 60 of the people in the world live in a coastal
    area.
  • Over 1 billion people rely on fish as their
    primary source of protein.
  • 90 of the worlds biomass is contained in the
    oceans.

16
Humans have not always taken care of these
resources
  • Chemical and petroleum spills
  • Sewage and waste dumping
  • Overfishing
  • Destruction of sea-life habitats

17
(No Transcript)
18
(No Transcript)
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22
(No Transcript)
23
(No Transcript)
24
Nature interacts with the ocean which affects
human life
  • Storms grow bigger and more dangerous as the
    ocean supplies them with warm, water-saturated
    air.
  • Coastal towns have milder winters and cooler
    summers.
  • El Niño and La Niña, periodic shifts of warm
    waters in the Pacific Ocean, can affect the
    climate worldwide.
About PowerShow.com