Ria recently read about earth's magnetic field and its causes. She became so much fascinated by the topic that she further studied it in detail. She collected information as follows :
• The magnitude of magnetic field at the Earth's surface ranges from 0.25 to 0.65 gauss.
• The Earth's magnetic field varies with time. There are short term and long term variations.
• One the scale of million years, the Earth's magnetic field reverses its direction, and much more.
She made a power point presentation on the same and shared all this information with her classmates.
(i) Suggest another activity related to the same topic, which will help a student to internalize-the same values gained by Ria.
(ii) Draw a labelled diagram showing the three magnetic elements of earth. [CBSE SQP 2016]