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Accessory
[ Accessory ]

·Astronomy: Accessory - SOLAR SYSTEM SIGHTS
·Astronomy: Accessory - FILTERING OUT LIGHT
·Astronomy: Accessory - FINDING THING
·Astronomy: Accessory - EASY POWER
·Astronomy: Accessory - DEWCAPS
·Astronomy: Accessory - CREATURE COMFORTS
·Astronomy: Accessory - THE BEST ACCESSORIES
 

 
 
Astronomy & Telescope Astronomy: Earth

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  Earth Earth: Astronomy: Earth - Weather-EARTH'S WEATHER

EARTH'S WEATHER

The interaction between the Sun's heat and Earth's atmosphere creates our weather. Other vital ingredients are the 23.5 degree tilt of Earth's axis, and the combination of land and water on Earth's surface. Because of its tilt, the Earth is heated unevenly, and this is accentuated by the different heat-absorbing characteristics of land and water.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:11:18 CST (8 reads)
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  Earth Earth: Astronomy: Earth - Rock-TYPES OF ROCK

TYPES OF ROCK

Crustal rocks and minerals appear in a bewildering array of types, since chemical elements can combine in myriad ways. But in broad terms, geologists recognize three kinds of rock.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:10:27 CST (8 reads)
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  Earth Earth: Astronomy: Earth - THE ORIGIN OF LIFE ON EARTH

THE ORIGIN OF LIFE ON EARTH

No o ne has yet figured out exactly how Earth passed from a state of having all the chemical building blocks necessary for life to a state where life actually existed. But the change, while enormously important, may not have been all that much of a leap.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:09:32 CST (8 reads)
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  Earth Earth: Astronomy: Earth - PEELING THE LAYERS

PEELING THE LAYERS

Although Earth's interior is nearby in astronomical terms—its center lies less than 4,000 miles (6,400 km) below our feet—it remains frustratingly out of reach. To look inside our planet, scientists rely on earthquakes, studying how seismic waves rebound and refract as they travel through the interior. In simple terms, the picture they give of Earth resembles an onion made of rock.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:08:17 CST (8 reads)
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  Earth Earth: Astronomy: Earth - A WATERY PLANET

A WATERY PLANET

Conditions on Earth's surface depend on the interaction of two spheres: the atmosphere and the hydrosphere.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:07:25 CST (8 reads)
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  Earth Earth: Astronomy: Earth - EARTH'S BIRTH

EARTH'S BIRTH

Some 4.6 billion years ago, the Solar System formed out of a cold cloud of interstellar gas and dust. The densest part of the cloud coalesced into the proto-Sun, while the remainder flattened into a far-flung disk called the solar nebula. Particles in the nebula collided and stuck, gradually accreting to form the planets.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:06:38 CST (8 reads)
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  Earth Earth: Astronomy: Earth - CONTINENTS ADRIFT

CONTINENTS ADRIFT

Earth differs from other planets in that its crust is made up of slabs of thin rock called plates. Driven by currents in the upper mantle, the plates, which number more than a dozen, carry the continents on their backs like rafts.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:05:20 CST (9 reads)
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  Earth Earth: Astronomy: Earth - AN OCEAN OF AIR

AN OCEAN OF AIR

Above the Earth's surface lies the atmosphere, an ocean of air that sustains life, drives our weather, and aids the breakdown of rocks into their constituent minerals.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:04:36 CST (8 reads)
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  Earth Earth: Astronomy: Earth

EARTH

Compared to the other planets in our Solar System, Earth is astonishingly active. Its surface is continually recycled and its atmosphere sustains a stunning variety of life.

 
 
  Posted by astronomy on Thursday, December 02 @ 14:03:49 CST (9 reads)
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