Final answer:
To convert the diameter of Earth from megameters to centimeters, multiply by 1,000,000 to get meters, and by 100 again to convert meters to centimeters. The Earth's diameter of 12.7 Mm is thus equivalent to 1.27 billion centimeters.
Step-by-step explanation:
The diameter of Earth is given as 12.7 Mm, which stands for megameters. To convert megameters to centimeters, we can use conversion factors. First, we know that 1 megameter (Mm) is equal to 1,000,000 meters (m), and 1 meter is equal to 100 centimeters (cm). Therefore, to convert the diameter of Earth from megameters to centimeters, you multiply by 1,000,000 to get meters, and then by 100 to get centimeters.
So, 12.7 Mm is equal to 12.7 x 1,000,000 x 100 cm, which simplifies to 1,270,000,000 cm or 1.27 billion centimeters.