The correct option is tera - 10^12.
Explanation
The International System of Units (SI) utilizes standard prefixes to denote decimal multiples and submultiples of units. Each prefix corresponds to a specific power of ten, facilitating the expression of measurements across varying scales.
Option Analysis:
- tera - 10^12 is Correct: The prefix tera (symbol T) corresponds to a factor of 1012.
- mega - 10^9 is Incorrect: The prefix mega (symbol M) corresponds to a factor of 106. The factor 109 is represented by the prefix giga.
- milli - 10^-6 is Incorrect: The prefix milli (symbol m) corresponds to a factor of 10-3. The factor 10-6 is represented by the prefix micro.
- nano - 10^-12 is Incorrect: The prefix nano (symbol n) corresponds to a factor of 10-9. The factor 10-12 is represented by the prefix pico.
Key Takeaway: Proficiency in SI prefixes is essential for scientific notation. Key prefixes include Tera (1012), Giga (109), Mega (106), Micro (10-6), Nano (10-9), and Pico (10-12).