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www.reference.com/science/earth-considered-closed-system-6a9d5fa963c1f0e4

Earth is considered a closed system because though heat enters, its mass remains essentially constant. The matter of Earth remains on Earth and in its atmosphere because gravity prevents it from migrating into space. Earth is also considered to be more of an approximati...

www.reference.com/science/color-earth-2c73eb53f05ea474

Earth, as viewed from space, is a mixture of green, brown, blue and white. Each one of these colors is representative of a different part of the Earth's crust.

www.reference.com/article/lines-make-up-earth-s-grid-system-28854a707dd4ebde

The most common grid system used to map the earth consists of latitude and longitude lines. Line zero for latitude is known as the equator, and it divides the northern and southern hemispheres. Line zero for longitude is the prime meridian, which runs though Greenwich, ...

www.reference.com/article/type-planet-earth-bde776145ac4de8

According to Encyclopædia Britannica, Earth is classified as a terrestrial planet. A terrestrial planet is rocky, in contrast to the predominantly gas planets found in the outer solar system.

www.reference.com/article/earth-formed-c869601bc08ffc25

Scientists estimate that the Earth was created approximately 4.54 billion years ago, which is less than 100 million years after the formation of the solar system. It is thought that the planet was created as a result of more than 10 different collisions between various ...

www.reference.com/article/planet-solar-system-closest-size-earth-c802d511e378d1c2

Venus is, by far, the closest match to the Earth in size. Venus has a measured diameter that is just about 95 percent that of the Earth and a planetary mass equal to 81.5 percent of the Earth's.

www.reference.com/article/purpose-earthing-1fbd80dd0b6dce6f

The purpose of earthing, also known as electrical grounding, is to keep people from touching an electrical hazard. Electrical grounding is also used with electronics to create less noise and to help with surge protection.