The National Geographic Magazine, Volume 181National Geographic Society., 1992 - Geography |
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Page 36
We see its glow extending a million miles from the edge of the sun . The corona is composed of the same gases as the rest of the sun : 90 percent hydrogen , almost 10 percent helium , and a tiny quantity of the other elements .
We see its glow extending a million miles from the edge of the sun . The corona is composed of the same gases as the rest of the sun : 90 percent hydrogen , almost 10 percent helium , and a tiny quantity of the other elements .
Page 41
Photosphere The sun's 300 - mile - thick visible surface churns at 10,000 ° F -Chromosphere The layer just above the photosphere ... JACK ZIRKER , NATIONAL SOLAR OBSERVATORY 41 DARKNESS SWEEPS HAWAII The tip of the moon's miles wide.
Photosphere The sun's 300 - mile - thick visible surface churns at 10,000 ° F -Chromosphere The layer just above the photosphere ... JACK ZIRKER , NATIONAL SOLAR OBSERVATORY 41 DARKNESS SWEEPS HAWAII The tip of the moon's miles wide.
Page
When they cut through Sideling Hill , six miles west of Hancock in western Maryland , to build Interstate 68 , they exposed a perfect example of a syncline - a U - shaped pattern of rock strata- laid down 330 to 345 million years ago ...
When they cut through Sideling Hill , six miles west of Hancock in western Maryland , to build Interstate 68 , they exposed a perfect example of a syncline - a U - shaped pattern of rock strata- laid down 330 to 345 million years ago ...
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