A.) Why was the 788,000-year-old crater not found before? Please elaborate on your answer.

Craters are said to be eroded by wind and rainfall over time or destroyed by tectonic movements.

So the 788,000-year-old crater is also likely to be eroded or destroyed by tectonic movements.  ✔​

B.) Make these sentences into English.

(01/03/24)

1. 일단 백 대를 먼저 주문하겠습니다.

First, I will place an order for 100 units.  ✔

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2. 처음에는 2 백 대를 주문하려고 하지 않았나요?

First, is it not for you to have placed an order for 200 units?  ✔

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3. 수요를 알아보기 위해서는 이런 기초단계가 필요합니다.

This kind of basic step is necessary to check demand.  ✔

​• Corrected: The sentences are corrected grammatically.