Почему на западе Южной Америки горы, а на востоке -  равнины?

0. (Thaks to the fact that, Thaks to, so) its geographical position Australia the Land Down Under.
1. (1. because, 2. that's why, 3. so that) most Australians live near the sea, sport is very popular, especially water sports. Australians are largely of British origin 2. (1. because, 2. due to, 3. so) they maintain close ties with the mother country. 3. (1. because, 2. so, 3. that's why) many Australians live near the coast, it's not surprising that 'going to the beach' is almost a way of life. 4. (1. so, 2. due to, 3. that's why) it's overall flatness and regular coastline, Australia is often called a 'sprawling pancake'. 5.(because, due to, thats why) they go to boaring schools or stay at home and take correspondence courses.One of the most interesting things about Australia's geography is its animal life, 6.(because, so, thats why) it has many animals that are unlike those found in other patys of the world. 7.(Thaks to, Due to the fact that, So that) Australia is located in the Southern Hemisphere, far away from Asia, and Europe, it has been called the "last place on earth".