Among the following items, the largest single source of radiation in the environment is
A) fallout.
B) radon.
C) medical diagnosis.
D) nuclear power plants.
E) cosmic rays.
B
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James Hutton studied rock formations in his native Scotland to determine that the Earth is much __________ than previously believed, and that catastrophes _________ shaped the landscape.
Fill in the blank(s) with the appropriate word(s).
The shapes of planetary orbits are __________
Fill in the blank(s) with correct word
The walls of an ice chest are made of 2.00-mm-thick insulation having a thermal conductivity 0.00300 W/m?K. The total surface area of the ice chest is 1.20 m2
If 4.00 kg of ice at 0.00°C are placed in the chest and the temperature of the outside surface of the chest is 20.0°C, how long does it take the ice to melt under steady state conditions? The latent heat of fusion of water is 79.6 cal/g = 334 kJ/kg. A) 4.22 h B) 22.1 h C) 17.6 h D) 1.33 d E) 10.3 h
The Jovian moons Io, Europa, Callisto and Triton are
A) larger than Pluto but smaller than Mercury B) smaller than Pluto C) about the same size as Pluto D) larger than Pluto but smaller than the Moon