Live Science is testing your rainforest expertise with a geography quiz. Earth's largest rainforest is the Amazon, sprawling across over 5.5 million square kilometers of South America. Second is the Congo Rainforest in central Africa, followed by the Southeast Asian rainforests spanning Indonesia, Malaysia, and the surrounding region. These three ecosystems account for the majority of tropical forest biodiversity globally and are critical regulators of our climate. How many can you correctly rank?

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