Earth is approximately _______ years old.
a. 4-5 billion
b. 4-5 trillion
c. 4-5 million
d. 6,000
e. 40-50 trillion
Answer: A
Earth is approximately _______ years old.
a. 4-5 billion
b. 4-5 trillion
c. 4-5 million
d. 6,000
e. 40-50 trillion
a. 4-5 billion
b. 4-5 trillion
c. 4-5 million
d. 6,000
e. 40-50 trillion