How was Earth formed?

Answer

While no one knows for certain how the Earth formed, scientists theorize that it formed over 4 million years ago after the sun went through its initial formation, gravity began to draw heavy particles together into a planet and solar winds blew away lighter gases. These heavy particles became the core of the planet. As the mass continued to grow, heavier particles sank to the center, according to Space.com.

As the Earth was forming, an object from space struck the new planet, causing particles to fly into space. Gravity pulled the particles together to form the moon. The remains of the object joined with the Earth to increase its overall size. Subduction in the Earth's mantle caused the formation of tectonic plates. These same forces caused the plates to divide and form the continents.

Earth's first atmosphere was blown away by solar winds. A second atmosphere formed from outgassing of the elements that formed the core. This second atmosphere included water vapor, nitrogen, carbon dioxide and other gases. The cooling cycle resulted in the formation of rain, leading to the development of oceans. This atmosphere was also instrumental in the development of life on the planet, according to Wikipedia. As life developed, the atmosphere changed again, due to the release of oxygen through photosynthesis.

Q&A Related to "How was Earth formed?"
There is much debate on how the earth formed. There are the evolutionary beliefs and then there are the religious beliefs on how the earth was created. You can find more information
http://www.ask.com/web-answers/Science/Other/how_d...
Crystals are minerals that grow. Their atoms bond to one another in regular, 3-dimensional patterns and use particular chemical compositions. A crystal such as a ruby-corundum-will
http://www.ehow.com/how-does_5192423_crystals-form...
Topaz forms in pegmatites and high temperature quartz veins. It is deposited by fluorine-rich vapors in rocks of rhyolite composition and forms in cavities in granites and rhyolites
http://wiki.answers.com/Q/How_is_topaz_formed_in_t...
In a 24 hour period, the Earth revolves 25,000 miles, at a speed of about 1,000 miles per hour. Around the Sun, the Earth revolves at 67,000 miles per hour.
http://www.ask.com/web-answers/Science/Astronomy/h...
1 Additional Answer
Ask.com Answer for: how was earth formed
Most scientists believe that the Earth was formed though a process called accretion. Shortly after the formation of the sun, orbiting rocky objects collided and compressed together forming planets.
Explore this Topic
The Earth is believed to have been created from a cloud of ionized particles around the sun; the way that it formed with the addition of mass through layers is ...
The specific type of rock that forms when magma cools at the Earth's surface is extrusive igneous rock. Igneous rock forms when magma cools, but where the magma ...
Iron was formed when the Earth was being formed. As the Earth got bigger the iron seeped into the crust of the earth and kept going. Iron is one of the most ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com