Answer:
Niagara Falls will have 35,000 years of formation then
Explanation:
1. Let's review the information given to us to answer the question correctly:
Niagara Falls was formed 10,000 years ago
Scientists predict it will last for another 25,000 years
2. How old will Niagara Falls be then?
10,000 + 25,000
35,000
Niagara Falls will have 35,000 years of formation then