The answer is A, 4.6 billion years old. The solar system was obviously formed after the big bang, and using the big bang theory and the birth of our sun, projections show that our solar system is at most 4.6 billion years old.
Answer:
a. the mekong river is the longest
No, this is false!
The area called the "Rust belt" is called like this because it used to be an important place for the industry, but it's not anymore, so the machines can be said to have gotten "rusty". This is the reason for the name, not the weather.
