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.Know More
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.Learn more about Earth Science
According to Universe Today, the duration of a day on Earth is the time it takes for the planet to complete a rotation around its axis. The Earth’s rotation takes 23 hours, 56 minutes and 4.1 seconds.Full Answer >
According to astrobiologist Jack O'Malley-James of the University of St. Andrews in Scotland, the sun will grow large enough to extinguish all life on Earth in roughly 2.8 billion years. The planet's non-microbial life will become extinct in 800 million to 1.3 billion years.Full Answer >
The Earth is referred to as "the blue planet" because of the abundance of water on the planet. Over 70 percent of the Earth's surface is comprised of water, producing a vivid blue color when viewed from space.Full Answer >
Seasons occur on Earth because the planet is tilted on its axis at just over 23 degrees. Both the Southern Hemisphere and the Northern Hemisphere are tilted closer to the sun as the planet completes a full orbit.Full Answer >