(16)...........The canyon is about 446 kms long and up to 29kms wide.

16/50

(16)...........The canyon is about 446 kms long and up to 29kms wide.

The Colorado River over millions of years

Formed by the Colorado River over millions of years

When it was formed by the Colorado River over millions of years

It was formed by the Colorado River over millions of years

Giải thích

Hướng dẫn giải:

Đáp án đúng: D

Hướng dẫn dịch: Nó được hình thành bởi sông Colorado qua hàng triệu năm.