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The Earth Takes Shape

Chapter 20 Section 3 Pages 624-629
by

Sherika Ray

on 26 July 2014

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Transcript of The Earth Takes Shape

The Earth Takes Shape
Home: The Perfect Place For Life
3RD From The Sun
Earth formed as planetesimals in the solar system collided and combined.
How Did Earth Become So Round And Perfectly Shaped???
As Earth gained more matter= force of gravity increases> As Earth grew in size the planet started to become more round.
Also as the Earth was changing shape, it was also heating up.
Planetesimals continued to collide with Earth and the energy of their motion heated the planet.


What are some modern day effects of the energy being trapped inside Earth from collisions?

What factors heated the Earth during early formation?
Earth's Layers
As rocks melted, denser materials such as nickel and iron sank to the center of the Earth and formed the _________?

Thin, outermost layer of Earth, the one we see and live on __________
Contains dense materials such as Nickel and Iron, center of Earth __________
Layer of Earth between the crust and core= Mantle
Earth's Atmosphere
Earth's atmosphere is 78% nitrogen, 21% oxygen and about 1% argon.

Scientist think that Earth's early atmosphere was a mixture of gases that were released as Earth cooled
. Molten rock released large large amounts of C02 and water vapor= scientists think that Earth's atmosphere was a steamy mixture of C02 and water vapor.
The Role Of Life
Scientist believe that ultraviolet (UV) radiation (also what causes sunburn) helped produce the conditions necessary for life
.

UV radiation= lots of energy > can break apart molecules on your skin and in the air.
Many molecules in the air and on Earth's surface were broken down.= overtime materials collected in Earth's waters.
Water offered protection from the effects of of UV radiation.
In sheltered pools pf water, chemicals may have combined to form the complex molecules that made life possible.
The Source Of Oxygen
4.3 billion years ago organisms that produced food by photosynthesis appeared.

Photosynthesis- the process of absorbing energy from the sun and CO2 from the atmosphere to make food. In the process oxygen is released. Sunlight+CO2= Glucose+ Oxygen(O2)

As the amount of oxygen in our atmosphere built up> formed a layer of the upper atmosphere > this ozone layer blocked most of the UV radiation and made it possible for life.


Simple plants moved to land about 2.2 billion years ago.
Formation Of Oceans
And Continents
Earth's oceans formed shortly after the Earth, when it cooled off enough for rain to fall and remain in the surface. After millions of years of rainfall, water began to cover the Earth.

What process allows for rainfall on Earth?
Formation Of Oceans
And Continents
The Growth Of Continents
Continents formed when lighter materials gathered on the surface and rose above sea level.

Approximately 2.5 billion years ago, continents really started to grow.
As Earth cooled it's atmosphere changed again due to volcanic gases. Volcanoes released chlorine, Nitrogen, sulfur and large amounts of CO2 and water vapor.
Scientist believe some of the water vapor may have condensed to form the Earth's first oceans.
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