Transcript Earth by Rachael and Rebecca

All About
Earth
BY RACHAEL AND REBECCA!
Our solar system
Planet Earth is the 3rd planet to the
sun
Earth is…
34.6% Iron
29.5% Oxygen
15.2% Silicon
12.7% Magnesium
2.4% Nickel
1.9% Sulfur
0.05% Titanium
Size:
382 × 345
Type:
28KB GIF
0- 40 Crust
40- 400 Upper mantle
400- 650 Transition region
650-2700 Lower mantle
2700-2890 D'' layer
2890-5150 Outer core
5150-6378 Inner core
Facts about Planet Earth
>Earth is the only planet
with life on it.
>The Earth's surface is
very young.
>The earth is 4.5 to 4.6
billion years old.
~
>Temperatures at the
Earth's center (called
the "core") may be as
high as 7500 K That's hotter than the
surface of the Sun!
Is Earth Small and Rocky or Big And
Smooth…
~Earth is a small, rocky planet which
supports a variety of life! As far as we
know, Earth is unique from all other
planets in this respect.
The solar system.
>The Earth is the densest major body
in the solar system. This means that
it's the most "compact" of all the
planets. For example, you have two
loaves of bread, both of the same
amount. You smash one loaf of bread
flat. Even though both loaves are of
the same amount, the smashed bread
is *denser* because it is more
compact.
How old is the Earth?
>The Earth is 4.5 to 4.6 billion years old, but
the oldest known rocks are less than 4 billion
years old. Rocks older than 3 billion years are
rare. The oldest fossils of living organisms are
less than 3.9 billion years old!
>Besides being the most interesting and
unique of all the planets, our Earth is also
the most beautiful. From space, the
Earth's white clouds, blue oceans and
brown lands seem to shine against the
black backdrop of our solar system.
The Earths atmosphere
>The Earth's atmosphere is 77% nitrogen,
21% oxygen, with traces of argon, carbon
dioxide and water. The carbon dioxide in the
Earth's atmosphere is very important. Carbon
dioxide helps to maintain the Earth's
temperature by way of the "Greenhouse
Effect." The Greenhouse Effect warms the
Earth's temperature; without it, the oceans
would freeze and life as we know it would be
impossible.
The Earth
>71 % of the Earth's surface is covered with water.
Earth is the only planet on which water can exist in
liquid form on the surface. Water is essential for
life as we know it. The Earth's vast oceans keep
temperatures stable - important for life on our
planet. Water is also responsible for most of the
erosion and weathering of the Earth's continents, a
process unique in our solar system.
>The Earth's surface is very young. This means that the Earth's
surface has changed a lot from when it was first formed. Erosion and
tectonic processes (like earthquakes) destroy, recreate and reshape
most of the Earth's surface.
What`s on Earth?
• Earth is a interesting planet I am happy
living on earth because we have oxygen
• On this not like many planets oxygen
comes from trees.
More about the solar system..
>The inner solar system contains Mercury,
Venus, Earth and Mars. These four
planets are closest to the Sun. The outer
solar system contains Jupiter, Saturn,
Uranus, Neptune and Pluto. The inner
planets are separated from the outer
planets by the Asteroid Belt.
Photos of Earth.
• Here is some photos of Earth.
• Earth is a fascinating planet.
• It is full of interesting stuff.
The end of our slide show