1. a)

Горизонтально:

1. valley

2. lakes

5. continent

6. forest

7. mountain

Вертикально:

1. volcano

3. desert

4. waterfall

b)

1. volcano

2. desert

3. waterfall

4. valley

2)

1. brilliant

2. mysterious

3. ancient

4. holiday

5. coral

6. colourful

7. unique

8. rare

3)

2. Coral reefs are dying around the world.

3. Some of the rarest species may go extinct very soon; such as, the red wolf, Saiga antelope, snow leopard and many more.

4. While exploring the hidden secrets of the ocean, you can discover lots of unique and colourful fish.