Using paleomagnetism to date rocks and fossils The Earth is like a gigantic magnet. It has a magnetic north and south pole and its magnetic field is everywhere (Figure 6a).

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Year to date (YTD) refers to the period beginning on the first day of the current calendar or fiscal year and extending up to the current date.

Maturity refers to a finite time period at the end of which the financial instrument will cease to exist and the principal is repaid with interest.