Original sentence: Eurasia is the Earth's largest landmass covering about 54,000,000 km² compared with the Americas (approximately 42,000,000 km²), Africa (approximately 30,000,000 km²), and Antarctica (approximately 13,000,000 km²)
Edited sentence: Eurasia is the Earth's largest continent covering about 54,000,000 km² compared with the Americas (approximately 42,000,000 km²), Africa (approximately 30,000,000 km²), and Antarctica (approximately 13,000,000 km²)