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Language change is driven by mistakes. If every generation of children learned perfectly what they heard spoken around them, then languages would be exact duplicates of themselves, stretching years into the past. But this isn't what happens. Errors, mishearings, inversion of sounds, dropping and adding of sounds, all these phenomena and more drive historical language change. You'll find a few of these systematic inconsistencies that result in other word forms below, as well as singular instances that don't fit a pattern where linguists can pinpoint exactly what went "wrong."

Celebrate Cinco de Mayo with English words of Spanish origin. Following the Mexican victory over the invading French army at the Battle of Puebla on May 5, 1862, Mexican communities in California and eventually the rest of the United States transformed this day into a celebration of Mexican culture.

Physical geography will be a breeze once you master this list of terms related to Earth's physical features. You'll review climate and weather, landforms and bodies of water, biomes and ecosystems, and the geological structure of the Earth — and that's just the tip of the iceberg!