Two examples would be: great depression and world war 2
I believe the answer is...
A magnifying glass will create a larger, virtual image because the glass is made of a convex lens.
Users make payments electronically than in person. Electronic payments have been made to provide a secure internet transaction. It is usually in 4 categories namely credit card,debit card, micropayment system and electronic cash. The answer in the situation where Lina switch to new provider for the online payment system is due to self-service.