Mai, Phong, and Mark are talking about the natural wonders they have visited. Read and decide which wonder in 3 each of them is talking about.

Mai:

It's an island located off the coast of South Korea. It was formed by the eruption of an underwater volcano about 2 million years ago. It ranks among the world's seven natural wonders. Every year, it receives millions of tourists.

1. _______

Phong

Visiting this place is a wonderful experience for adventurers like me. It's the largest desert on Earth, covering over 9 million square kilometres. You can see red sand and beautiful sand dunes everywhere. You can also see plant life and even nomadic men with their camels.

2. _______

Mark:

It's a UNESCO World Heritage Site and one of the greatest tourist attractions of the USA! It's 446 kilometres long, up to 29 kilometres wide, and over 1,800 metres deep. Some people say that it's the most magnificent landscape on Earth.

3. _______