Physical regions of the world are categorized based on their distance from which equatorial line?

The correct answer is the Equator, which is the key reference line used to categorize the physical regions of the world based on latitude. The Equator divides the Earth into the Northern and Southern Hemispheres, making it an important reference point when discussing climate, biomes, and various ecological zones. Regions near the Equator typically experience a tropical climate, characterized by warm temperatures and high levels of precipitation year-round, whereas areas further away from the Equator exhibit a wider range of climates, from temperate to polar. Understanding the significance of the Equator helps in comprehending global weather patterns, biodiversity, and cultural differences influenced by geography.

The other options play important roles in geography but do not serve as primary indicators of physical region categorization based on distance from the equator. The Prime Meridian is a longitudinal reference line, while the Tropic of Capricorn marks a specific parallel relevant to climate but does not inherently categorize regions like the Equator does. The International Date Line, on the other hand, primarily relates to timekeeping rather than geographical classification.