Match the underlined words in the article to the meanings. 1 a place in a desert where there is water, plants and trees 2 a large, round object that moves around the Sun 3 hills of sand 4 below the surface of the ground 5 the activity or sport of riding a board over the sand 6 the heat and flames from something burning 7 large sea animals with hair around their ears and neck 8 a large hole in the ground from which people take gold or similar things