Read the following passage and answer the questions that follow-
Passage:

The Blue Mormtains. just 90 minutes from Sydney. get their name from the natural blue haze created by vast eucalyptus forests in this World Heritage area. Titty droplets of oil released from the trees mix with water vapour and sunlight to produce the distinctive colour.

Etched with deep fissures that have been chiselled and shaped over ages from the sandstone of an ancient sea. the Blue Mountains is ideal for the tln'illing adventure sport of canyoning. A rope-assisted descent into a canyon or cave. canyoning gives access to a beautiful subterranean world. With its dramatic vistas. soaring forests. deep gorges. waterfalls and htmdreds of kilometres of walking trails, the Blue Momitains saves its best for bushwalkers.

A highlight of the Greater Blue Moruitains World Heritage Area. Jenolan Caves is a labyrinth of stalactite-lined limestone chasms carved by undergrormd rivers . Set in a deep and secluded valley on the western edge of the Blue Mormtains. the pure underground rivers and amazing fomiations inside the caves make this one of the finest cave systems in the world. With 11 spectacular show caves, underground rivers and awe-inspiring formations, you can explore the caves on a guided day tour. get goose bumps on a ghost tour or enjoy a monthly cave concert with natiu‘al acoustics and fairy tale ambience.

Another way to experience the natural splendom‘ of the Blue Mountains is by biking or walking. Blue Mountain Bikes provide a mobile service that meets you with bikes. equipment and maps. You can also discover the Blue Mountains' rich Aboriginal heritage on a walking tour with a local guide. It's best to join a guided tour if you're unfamiliar with the region and weather conditions. A trip to the Blue Mountains wouldn't be complete without visiting Katoomba. There you can ride the Scenic Skyway gondola across Jamison Valley. taking in views of the Three
Sisters. Mount Solitaiy and Katoomba Falls. You can also visit the Scenic Railway. the world's steepest incline railway. descending more than 400 metres (0.25 miles) down the escarpment. This thrilling ride passes through a long ttumel and gorge. ending 011 the valley floor, and is a huge hit with children.

With thousands of plants from the southem hemisphere and around the world, including the rare Wollemi Pine, the Blue Mormtains Botanic Garden at Mormt Tomah is a must-see for nature lovers. The cool climate garden is 1000 metres (0.62 miles) above sea level and has shunting views across the area. Wander around the estate and explore the many formal gardens. The region is also worth checking out to understand why it was classified a World Heritage Area.