We find from igneous rock dating that the polarity of the Earth's magnetic field has undergone many unexplained changes in periods of thousands of years
Indicate whether the statement is true or false
TRUE
Physics & Space Science
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If you move an electron from the ground state to a higher energy level, the atom becomes an excited atom
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
Neutral hydrogen can be detected because its electron occasionally ________ its spin and creates the 21-cm emission line for radio observers
Fill in the blank(s) with correct word
Physics & Space Science
The term Cambrian explosion refers to
a. an asteroid impact. b. the breakup of a supercontinent. c. intense, widespread volcanic activity. d. a proliferation of life forms.
Physics & Space Science
Ref. 59 finds that lead deposition decreases after 1979 . What could be the reason? Suggest a possible answer. Justify your suggestion
What will be an ideal response?
Physics & Space Science