1) is considered the longest river in the world. a) The Nile River  b) Nile River  2) for its vast sand dunes and extreme temperatures. a) Sahara Desert b) The Sahara Desert 3) is often referred to as the "lungs of the Earth a) The Amazon Rainforest b) Amazon Rainforest 4) stretch across several states in the United States and Canada. a) Rocky Mountains b) The Rocky Mountains 5) of China is a famous historical landmark a) The Great Wall b) Great Wall 6) is the largest ocean on our planet. a) Pacific Ocean b) The Pacific Ocean 7) are home to some of the highest peaks in the world, including Mount Everest. a) The Himalayas b) Himalayas 8) is rich in marine biodiversity. a) Gulf of Mexico b) The Gulf of Mexico 9) are the longest mountain range in the world. a) The Andes Mountains b) Andes Mountains 10) is famous for its ancient history and architecture. a) The city of Rome b) City of Rome 11) are a group of five large lakes located in North America. a) The Great Lakes b) Great Lakes 12) separates England from France. a) English Channel b) The English Channel

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