GEOG 2050 : Geography Exam 1
Document Summary
June (21st) solstice- vertical ray intersects tropic of cancer 23. 50 n, tangent ray. December (21st) solstice- vertical ray intersects tropic of capricorn 23. 50 s, March & september equinox- equator 00, tangent ray north & south poles. Midnight sun- north of the arctic circle during the summer. Radio waves(short), microwaves, infrared(long), visible, uv, x-rays, gamma. Types of radiation emitted by the sun- 8% uv, x-ray, & gamma; 47% visible light; and 45% infrared. Wavelengths that we feel as heat 5. 5-103 micrometers. Origin of the universe formed 13. 5-15 billion yrs ago by big bang theory. Solar system formation- heavier materials clump near center to inner most planets and lighter materials coalesce near periphery to form outer planets. Earth forms out of iron, nickel, manganese & silicates. Sun- 99. 9% mass of the solar system; diameter 1,392,000 km; 74% hydrogen, 25% helium, <2% other; nuclear fusion of hydrogen atoms produce helium and releases energy; surface= 5770 k (99410 f), core= 28 million0 f.
