Answer: Earth's magnetic field has flipped its polarity many times over the ... Earth has settled in the last 20 million years into a pattern of a pole reversal about ... And while reversals have happened more frequently in "recent" years, when ... per year, as opposed to about 10 miles per year in the early 20th century.
Explanation:
Explanation:
A control is important for an experiment because it allows the experiment to minimize the changes in all other variables except the one being tested.
False, it does. Hope this helped!
Answer: 7
Explanation:
I might be wrong but let me know if it is or not.
Here, Your answer would be option D) Voltage Source.
Charge flows from it in a particular direction, and a charge ( static or dynamic ) creates an electric field around it (can be experimentally observed by a test charge), whereas all the other options are appliances which needs current ( rate of flow of charge ) to work.
In short, Your correct Answer would be Option D)-Voltage Source.
Hope this helps!
