The planet earth

1. The Planet Earth

2. Introduction of Planet Earth
• Earth is the third planet from
the Sun, the densest planet in
the Solar System, the largest of
the Solar System's four terrestrial
planets, and the only astronomical
object known to harbor life.

3. Land
• Land, sometimes referred to as dry land,
is the solid surface of the Earth that is not
permanently covered by water. The vast
majority of human activity occurs
in land areas that support agriculture,
habitat, and various natural resources.

4. The seven continents
• Africa
• Antarctica
• Asia
• Europe
• North America
• Oceania

5. Africa
Africa is the world's second-largest
and second-most-populous continent.
At about 30.2 million km2 (11.7
million sq mi) including adjacent
islands, it covers six percent of Earth's
total surface area and 20.4 percent of
its total land area.[2] With 1.1 billion
people as of 2013, it accounts for about
15% of the world's human
population.[1] The continent is
surrounded by the Mediterranean
Sea to the north, both the Suez
Canal and the Red Sea along the Sinai
Peninsula to the northeast, the Indian
Ocean to the southeast, and the Atlantic
Ocean to the west. The continent
includes Madagascar and
various archipelagos. It has 54 fully
recognized sovereign
states(or countries), nine territories and
two de facto independent states with
limited or no recognition.

6. Antarctica
Antarctica is Earth's southernmost
continent, containing the
geographic South Pole. It is situated in
the Antarctic region of the Southern
Hemisphere, almost entirely south of
the Antarctic Circle, and is surrounded
by the Southern Ocean. At 14,000,000
square kilometres (5,400,000 square
miles), it is the fifth-largest continent
in area after Asia, Africa, North
America, and South America. For
comparison, Antarctica is nearly twice
the size of Australia. About 98% of
Antarctica is covered by ice that
averages 1.9 kilometres (1.2 mi) in
thickness,[6] which extends to all but
the northernmost reaches of
the Antarctic Peninsula.

7. Asia
Asia is the Earth's largest and most
populous continent, located primarily in
the eastern and northern hemispheres.
Asia covers an area of 44,579,000 square
kilo meters, about 30% of Earth's total
land area and 8.7% of the Earth's total
surface area. It has historically been home
to the world's first modern civilizations
and has always hosted the bulk of the
planet's human population.[3] Asia is
notable for not only overall large size and
population, but unusually dense and large
settlements as well as vast barely
populated regions within the continent of
4.4 billion people. The boundaries of Asia
are traditionally determined as that
of Eurasia, as there is no significant
geographical separation between Asia and
Europe. The most commonly accepted
boundaries place Asia to the east of
the Suez Canal, the Ural River, and
the Ural Mountains, and south of
the Caucasus Mountains and
the Caspian and Black Seas.[4] It is
bounded on the east by the Pacific Ocean,
on the south by the Indian Ocean and on
the north by the Arctic Ocean.

8. Europe
Europe is a continent that comprises
the westernmost part of Eurasia.
Europe is bordered by the Arctic
Ocean to the north, the Atlantic
Ocean to the west, and
the Mediterranean Sea to the south. To
the east and southeast, Europe is
generally considered as separated from
Asia by the watershed divides of
the Ural and Caucasus Mountains,
the Ural River,
theCaspian and Black Seas, and the
waterways of the Turkish Straits.[5] Yet
the borders of Europe—a concept
dating back to classical antiquity—are
arbitrary, as the
primarily physiographic term
"continent" also incorporates cultural
and political elements.

9. North
America
North America is
a continent entirely within
the Northern Hemisphere and
almost all within the Western
Hemisphere. It can also be
considered a
northern subcontinent of
the Americas.[2] It is bordered
to the north by the Arctic
Ocean, to the east by
the Atlantic Ocean, to the west
and south by the Pacific
Ocean, and to the southeast
by South America and
the Caribbean Sea.

10. Oceania
Oceania is
a region centered on
the islands of the tropical
Pacific Ocean.[4] Opinions
of what constitutes Oceania
range from its
three subregions of Melane
sia, Micronesia, and
Polynesia[5] to, more
broadly, the entire insular
region between Southeast
Asia and the Americas,
including Australasia and
the Malay Archipelago.[6]

11. South
America
South America is
a continent located in
the Western Hemisphere,
mostly in the Southern
Hemisphere, with a
relatively small portion in
the Northern Hemisphere.
It is also considered as
a subcontinent of
the Americas,[1] which is
the model used in Spanish-
speaking nations and most
of South America.

12. The Water
• Water is a transparent fluid which forms the
world's streams, lakes, oceans and rain, and is the
major constituent of the fluids of organisms. As
a chemical compound, a water molecule contains
one oxygen and two hydrogen atoms that are
connected by covalent bonds. Water is
a liquid at standard ambient temperature and
pressure, but it often co-exists on Earth with
its solid state, ice; and gaseous state, steam (water
vapor). It also exists as snow, fog, dew and cloud.