Atomic nuclei that decay of their own accord are said to be ______________
Fill in the blank(s) with correct word
radioactive, or radionuclides
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Many facilities that burn wood and hog waste (residues) are currently operating in the United States
What will be an ideal response?
The atmospheric division that lies directly above the stratosphere is the ______________
Fill in the blank(s) with correct word
What direct evidence is there for galactic collisions? Discuss examples of directly observable phenomena linked to collisions
What will be an ideal response?
The Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by
a. using Hubble's law. b. measuring Doppler shifts of different parts of the disk. c. the steady state theory. d. measuring Doppler shifts of different parts of the disk.