Answer: The oldest one is Vredfort Crater.
Step-by-step explanation:
The data is:
Chicxulub was formed 6.5x10^7 years ago.
Vredfort was formed 2x10^9 years ago.
Sudbury basin was formed 1.8x10^9 years ago.
Acraman crater was formed 5.8x10^8 years ago.
We want to find the oldest, so we need to find the larger number of the 4 we have.
For this, we need to see at the exponents, the larger the exponent the larger the number.
We have two with a 9 in the exponent:
Vredfort and Sudbury.
Now we look at the number, Vredfort has 2x10^9 and Sudbury has 1.8x10^9.
Both have the same exponent, but the scalar of Vredfort is larger (2 is greater than 1.8) so we have that Vredfort is older.
