Final answer:
The Earth's radius is written in scientific notation as 6.371 × 10⁶ meters, following the standard format of one nonzero digit to the left of the decimal point.
Step-by-step explanation:
The radius of Earth, when measured from the center to the pole, is approximately 6,371 kilometers. When we convert this measurement into meters, remembering that 1 kilometer is equal to 1,000 meters, we get 6,371,000 meters. However, to express this in scientific notation with a single-digit number multiplied by a power of 10, we would write it as 6.371 × 10⁶ meters. This format follows the scientific notation convention where there is only one nonzero digit to the left of the decimal point, making calculations and comparisons with other large or small numbers easier.