Active galactic nuclei are usually powered by supermassive black holes
Indicate whether the statement is true or false
TRUE
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The magnetic field of Earth is thought to be generated by motions in its
a. atmosphere. b. liquid water oceans. c. solid surface. d. molten iron interior.
The ______________ surrounds the nucleus of a comet
a. head or coma b. cloud c. fuzz d. cover e. epinucleus
A balanced chemical equation will have the same ______________ on each side
a. number of moles b. number of molecules c. mass of each compound d. number of atoms of each element
Where did Thomson's model place electrons in the atom?
a. Studded throughout a positively-charged material. b. Rotating around a positively-charged core. c. Uniformly distributed in the atom. d. Clustered in the center of a positively-charged sphere. e. At the two magnetic poles of the atom.