Answer: Scientists found evidence of Earth's magnetic field reversal in rocks on the ocean floor at plate boundaries. These rocks have alternating polarity due to magnetization that were during their cooling period. Using radiometric dating, scientists estimate that reversals occur approximately every several hundred thousand years.
Explanation: The earth’s magnetic field impacts into the alignment of elements like iron in rocks due to Ferro-magnetization. This causes the elements to align in a north-south direction. Accordingly scientists have studied this alignment in ancient rocks, such as in the layers of sedimentary rocks, and realized that the earth magnetic field has flipped around 200,000 to 300,000 in the last 20 million years.
- - The rate, according to physics, of doing work, is called "power"
A quantity which have both magnitude and direction is know as vector quantity.
Resultant vector is 6.81 m south east.
Triangle law of vector addition is when two vectors are represented as two sides of the triangle with the order of magnitude and direction, then the third side of the triangle represents the magnitude and direction of the resultant vector.
Since, vector K is 3.0 m north and vector L is 8.6 m southeast
So, angle between vectors K and L is,
90+45 = 135 degree
Resultant vector, 

So, Resultant vector R is 6.81 m with direction of southeast.
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Answer:
True
Explanation:
Any energy that is made by the sun or any other energy maker, would be renewable energy because it can be reproduced in 100 years or less.