1 What does the name 'Iguazu' mean in an old language?, 2 Where does the Amazon River begin?, 3 Why can't people build bridges on the Amazon River?, 4 How long can anacondas grow in the Amazon rainforest?, 1 When do glaciers begin?, 2 How do mountain glaciers move down the mountain?, 3 What are icebergs?, 4 Why are icebergs dangerous for boats?, 1 What comes out of the ground when you look at a geyser?, 2 What makes the water deep under the ground boil?, 3 What are the white cliffs at Pamukkale in Turkey really made of?, 4 Why do monkeys in Japan sit in the water at Jigokudani Monkey Park?, 1 Where is Lake Baikal, and how deep is it?, 2 How do scientists explore Lake Baikal?, 3 What is the biggest mountain chain in the world?, 4 How many millimeters does Mount Everest grow every year?

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